Question

10. Solve by factoring: y = x2 - 6x + 9
for y = 0.

Answer 1

x=3

Explanation:

y = x^2 - 6x + 9

What two numbers multiply to 9 and add to -6

-3*-3 = 0

-3+-3 = -6

y = (x-3) (x-3)

Setting y = 0

0 = (x-3) (x-3)

x-3 = 0 x-3 = 0

x=3 x=3