Question

What is the vertex of 2(n+9)(n-6)

Answer 1

(-1.5, -112.5)

Explanation:

f(n) = 2(n + 9)(n - 6) = 0

n = -9, n = 6

½(6 - (-9)) = ½(15) = 7.5

-9 + 7.5 = -1.5

f(-1.5) = 2(-1.5 + 9)(-1.5 - 6)

= 2(7.5)(-7.5)

= -(15 × 7.5)

= -(75 + 37.5)

= - 112.5