Question

What is the vertex of the graph of y = -4(x + 2)2 + 5?


(2, 5)
(-2, 5)
(5, -2)
(5, 2)

Answer 1

If \(\large y = a(x-h)^2 + k\), then the vertex is: (h, k)

Answer 2

ok so its A. (2,5)

Answer 3

Compare:
y = a(x-h)^2 + k to
y = -4(x+2)^2 + 5

- h = +2; h = -2
+k = +5; k = 5

Vertex (-2, 5)

Answer 4

oh so if the h is positive, you turn it into negative

Answer 5

yes. k remains the same sign.

Answer 6

thank you!

Answer 7

yw.