square root of (|– 3| times negative 2 squared times (8 minus 20))=? BASIC MATH Practice!

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[goodygiggles]

@13:20 I went ahead and used the calculator and negative two squared equaled four.

[mygreatbigfoot]

Thank you. I learnt two things, that the [absolute number] = value of distance from 0 and the difference between -2 squared = -4 and (-2) squared = 4.

[dazartingstall]

√(|−3| × −2² × (8 − 20))
√(3 × −4 × −12)
√144
12

[WasimBarri]

I'm a retired mathematics teacher for over 35 years and have never seen or used -2^2 but have seen (-2)^2 and 3-2^2 where, in this case, the negative sign is actually a subtract sign. Its ambiguous whether that sign means a negative number or something else.

[marccracchiolo]

Great video I hate when you’re right that’s exactly where I made my mistake. I think it’s great how you threw in the exponent to square root equivalent which as you pointed out is the rule which allows us to go into the square root in the first place. It really being a parentheses. And thank for reminding us you can multiply the exponent in a parentheses when it’s fractional.

[cissewae_academy]

I disagree with you. if the equation says 3 - 2^2, then we will have to split the - sign from 2^2 and it will be 3 - 4, but the equation says 3 x -2^2, we don't have to split - sign from 2 because it's -2 itself raised to power 2, it will surely give us 3 x 4 which is +12, so therefore, square root of 12 x -12 is equal to 12i.

[onenewworldmonkey]

I just subscribed. My last algebra class was 1982 and I got it WRONG. lol. I, for some unknown reason, knew the absolute value. What I did wrong was thinking the "X" was an x whereas you meant it to be "times". That was underhanded.

[StevenStyczinski-sycj]

If I have any question about the order of operations I use a lot of parentheses. Starting with PEMDAS. That is something like PE (M, D) (A, S) . Computers and calculators are not very forgiving if you don’t type it in EXACTLY like it is expecting it.

[wizardsuth]

When you convert equations to reverse Polish notation the order of operations becomes explicit, which is why a lot of software uses this approach. But have you ever tried to simplify such an expression?

[NMalteC]

Got 12 after looking at the YouTube thumbnail for 30 seconds. It's not really that complicated

[DevilDog]

16:18

Actually you are half right.
The square root of 144 is 12 & -12.

[Ihab.A]

I got the same answer as yours, only the opposite sign. At the end, we were at step where we had to take the square root of negative 12 by negative 12. So it is already given to us that the result is -12. Had the step been SQR of 144, I'd agree that the answer is either 12 or -12, but we already have -X.-X so why should the answer be X, -X, rather than simply - X?

[panzerabwerkanone]

The self portraits of Mr. YouTube Math Man scare me more than the problem solving.

[BongileHlatjwako]

😮😮 I was really helped now i can d it thanks 🎉🎉

[youtooyoutoo]

re 12:36The '-' is not subtraction, it is the sign of the article, which takes precedence over the preceding multiplication sign, but not the exponent. (3*(-(2^^2)*(-12)))^^(1/2)

[robertstuart]

For clarification purposes, there should be parentheses enclosing the entire-2^2 expression. The result would still be -4.

[Sailoralso]

12 Edit, , There are many 'implied' parenthesis' and this problem illustrates 4 cases of parenthesis or implied The lines that bracket for 'absolute value' are a type of parenthesis, , the -2 squared is another the implication is that the number 2 squared as a total is squared, , there is a true parenthesis and then the square root symbol that encompasses the entire problem is another implied parenthesis. And just as you showed, , , with Youtube shoving 6 commercials down my throat every 1.75 minutes Resolve the the three separate items under the square root symbol and then you can tackle that all encompassing square root,
One set of parenthesis and three implied parenthesis.

[douglasslater]

Very good. I should have continued with math but didn't. I could do this with you teaching. I was catching on. Interesting.

[greenmanofkent]

In the (badly written) title, does the phrase "... negative 2 squared ..." mean - (2^2) or (-2)^2 ? It is completely ambiguous, and I maintain it means the latter [ (-2)^2 ], since English does not have PEMDAS rules. Furthermore, the use of the word *negative* means it *has* to refer to the 2; it is not the same as the word *minus* here. Very badly (actually wrongly) worded - in fact it does not match the mathematical expression.

[JoelOkley]

This is a complex number √-144= 12i, where √-1 = i. So we have √144×√-1, which will be 12×√-1=12i