Question

Pls help reward the brainiest

Answer 1

Answer:

y=(x+4)^2 -37

Step-by-step explanation:

y+ ? = x^2 +8x+ ?-21

y+? =x^2+8x +16-21

y+16=x^2+8x+16-21

y+16=(x+4)^2 -21

y=(x+4)^2-21-16

Calculate the difference

y=(x+4)^2 -37