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What is the answer to f(x)=5x2-20

 Oct 12, 2017
 #1
avatar+50 
0

Simplifying F(x) = 5x2 + -20

Multiply F * x xF = 5x2 + -20

Reorder the terms: xF = -20 + 5x2

Solving xF = -20 + 5x2

Solving for variable 'x'.

Reorder the terms: 20 + xF + -5x2 = -20 + 5x2 + 20 + -5x2

Reorder the terms: 20 + xF + -5x2 = -20 + 20 + 5x2 + -5x2

Combine like terms: -20 + 20 = 0 20 + xF + -5x2 = 0 + 5x2 + -5x2 20 + xF + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0 20 + xF + -5x2 = 0

The solution to this equation could not be determined.

 Oct 12, 2017
 #2
avatar+771 
+1

f(x)=5x2-20

This can be applied to the formula ax2+bx+c. B just equals 0, canceling that part.

I would use max method.

Multiply a by c.

a*b=5*-20=-100

Find two factors of 100 that add to 0 and multiply to -100

In this case, it is 10 and -10

(x+10)(x-10)

That is this equations factored form. If you want me to solve for anything else, let me now.

 Oct 12, 2017

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