Write f(x) in standard form by completing the square.
f(x)= -5x^2 + 80x - 318

Question

Write f(x) in standard form by completing the square.
f(x)= -5x^2 + 80x - 318

anonymous · Answer

???

anonymous · Answer

X=8+or-(sqroot10)/5

jim766 · Answer

-5x^2+ 80x - 318 = 0              1st   get the 318 out of there        
                   +318     +318

-5x^2+80x = 318                     now find Gcf of 5x^2 + 80x

-5(x^2-16x) = 318                     now complete the square

jim766 · Answer

-5(x^2-16x) = 318                     now complete the square

                                              -16/2 = -8 , now  square it  = 64

-5(x^2-16x + 64) = 318 + 64

-5(x^2-8)^2= 382

jim766 · Answer

now move the 382 back over

f(x) = -5(x-8)^2 - 382          

does this make sense?

anonymous · Answer

no not really what would the answer be?

jim766 · Answer

that is the answer  
it is in vertex form

anonymous · Answer

My answer is in standard form

jim766 · Answer

yeah same thing

anonymous · Answer

thanks alot guys