Finding Zeros of a Function (Factoring & Basic Math Functions) #shorts #math #maths

[Soul._.Seeker]

This can also be solved like this:
5(x-3)(x+1)=0
(x-3)(x+1)=0\5
x-3=0 and x+1=0
x=3 and x=-1
Therefore x=3 is the answer

[equinox]

I love these problems because you don’t have to do the whole solving process, just a bit of logic and trial and error.

[justaguy]

y’all who aren’t american, it doesn’t help anyone to call this stuff “easy”, because it probably is to you, and the SAT tests more time management anyways. But for the love of god nobody cares if you learn this early in x country, you probably do in america too, so what if this is on this test. Also, some just struggle with math, these are just helpful guides for those that do.

[xzm]

3, just by a quick look. Mul three numbs and one ofem zero then zero

[cadencook]

I saw the problem, immediately went through the whole proccess of quadratics, factoring, etc and then came back and saw him do this. Safe to say this is a problem that is easy to overcomplicate

[orcaking]

Where do you get these online work sheets?

[FoosterExtra]

I just got answer before the tutor.

🎉 It looks as a quadratic equation:

5(x-3)(x+1)=0
(5x-15)(x+1)= 0
5x²+5x-15x-15= 0
5x²-10x=15
x= 15/5= -3, 3

And we have to take only+ve value i.e., 3. [Because quadratic solutions have two values as one is positive and second is negative]

😊

[abhaagrawal]

Even a 13 yr old can answer just by literally looking at the question

[pandu]

Both 3 and -1 satisfy the question, but they asked the + ve one, so the answer is 3

[RT-dohj]

You are wrong in your explanation, just say x=3; you can't say x=+3 for the first bracket and then x=-1 for the second bracket, you got 2 values for your x. You have to remember that any number that you multiply with Zero is equal to Zero, so in the first bracket assigning x=3 will automatically result the equation to Zero.

[kris_]

Hi love ur channel
I love maths im bout 3 grades ahead

[suhas]

This shit is on your EXAM QUESTIONS?! Why didn't I move to America...

[sumanshrestha]

Plz don’t define by words, do it in the mathematics language..

[조현우-qb]

Is this problem from SAT…?? Not for middle school??

[vinayaksubramani]

This is taught in 8 grade in Basic factorisation

[abhiplays]

Mf what question is this . If this comes in sat I'm topper of it 🤧

[ElevatorFan]

x=3, because any number times 0 is 0 and 3-3=0

[ya_Yash]

He did that in a logical way.

Here's the mathematical proof :-

5(x-3)(x+1)=0
Multiply the brackets,
5(x²+x-3x-3)=0
5(x²-2x-3)=0
5x²-10x-15=0
Splitting the middle term,
5x²-15x+5x-15=0
5x(x-3)+5(x-3)=0
(x-3)(5x+5)=0

x-3=0 or 5x+5=0
x=3 or 5x=-5 ==> x=-1

Since, only postive value is 3 then value of x is 3