Asked by Anonymous

How to solve y = -0.04x^2 + 1.3x + 56 using the quadratic formula?
Answered by bobpursley
Solve? You mean the zeroes?
y=0=-0.04x^2 + 1.3x + 56

x=(1.3 +-sqrt(1.3^2+3*.04*56)/(.08)

do the math.
Answered by Anonymous
Do you mean 4*0.4? And how did you get positive 0.4? That was the part that confused me.
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