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Use the form ax^2 + bx +c to find values for a, b and c:

a = -1, b = -10 and c = -20

The vertex form is written as a(x+d)^2 +e

d = b/2a = -10/2*-1 = 5

e = c-b^2/4a =  -20 - /-10^2/4*-1 = 5

Replace the letters with their values in the vertex form formula:

-(x+5)^2 + 5

The third choice is the correct one.

y = -(x + 5)^2 + 5

Step-by-step explanation:

y = -x^2 - 10x - 20

y = -(x^2 + 10x + 20)

y = - (x^2 + 2 * 5 * x + 25 - 5)

y = -(x + 5)^2 + 5

Answer

y = -(x + 5)^2 + 5

answer: kljdcdhjbdlchjad oac apoich a

step-by-step explanation:

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right