Question

A quadratic equation is written in four equivalent forms below.

I. y = (x - 8)(x - 4)
II. y = x(x - 12) + 32
III. y = (x - 6)2 - 4
IV. y = x2 - 12x + 32

Which of the forms shown above would be the most useful if attempting to find the x-intercepts of the quadratic equation?

Answer 1

Question I. All you have to do is but 0 for y and then solve (x-8)=0 and (x-4)=0