Write y=-3x^2+12x-21 in vertex form

A) y=-3 (x-2) ^2-9

B) y=-3 (x+2) ^2-9

C) y=-3 (x+2) ^2+9

D) y=-3 (x-2) ^2+9

Question

Nathaniel Owen

21 June, 11:31

+4

Answers (2)

Know the Answer?

Happyt · Answer 1

Complete the square:

y = 3x^2 - 12x + 4

y = 3 (x^2 - 4x) + 4

y = 3 (x^2 - 4x + 4 - 4) + 4

y = 3 (x^2 - 4x + 4) - 12 + 4

y = 3 (x - 2) ^2 - 8

Averi Lloyd · Answer 2

The vertex form of any function is : f (x) = a (x-h) ^2 + k

Hence the correct option would be: A) : " - 3 (x-2) ^2-9"

Write y=-3x^2+12x-21 in vertex formA) y=-3 (x-2) ^2-9B) y=-3 (x+2) ^2-9C) y=-3 (x+2) ^2+9D) y=-3 (x-2) ^2+9