How to Find the Maximum or Minimum Value of a Quadratic Function Easily

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[neeradwivedi]

FINALLY FOUND THE VIDEO WHICH REALLY HELPED ME OUT FINDIND THE MINIMUM AND MAXIMUM VALUE WHICH SUCH A GOOD ANIMATION, ,,,HATS OFF TO YOU

[Kittymayo]

Literal crime these videos didn’t exist when I was in high school

[DM]

-b/2a came from the fact that this is a quadratic equation which means if you differentiate it you'll get 4x+5, and minimum or maximum occurs where dy/dx = 0, so 4x + 5 = 0, so x = -1.25 . Plug in this in the equation to get 0.875. We know that equation is opening upward (positive coefficient of x^2) and therefore 0.875 is the minimum.

[MelonsTnt]

thanks a bunch
I've got an upcoming SAT test and I'm doing really good but then stumbled on a question in which I must calculate the minimum value of the function.
I read its explanation but was left puzzled as it used a rule of: a(x-h)+k where h is the minimum
I have not yet taken this specific rule at school so yours is a life saver

[thamizhabgmcollection]

You were my last hope and guess what you save me

[thesecretcommenter]

You saved me, I've been struggling for hours!

[Tropical-Bello]

I genuinely love you, god bless brother

[techmay]

x² - 2x + 3 in this eq by applying this method the ans is coming 3 but its min. Value is 2

[phoenixuprise]

Can someone please explain how he got f(-1.25)=0.875 at the end?
I don't know how he solved f(-125)=2(-125)2+5(-125)+4 to get 0.875

I'm super confused.

[dipalibaul]

Btw if a range is given, this method might not work

[BigRed]

Jesus Christ is coming soon repent of your sins and turn to him before it's too late