Question

Which quadratic equation is equivalent to (x + 2)2 + 5(x + 2) – 6 = 0?

Answer 1

u2 + 5u – 6 = 0 where u = (x + 2)

Answer 2

quadratic is in the form
ax^2+bx+c=0

so distribute and stuff and simplify
remember
a(b+c)=ab+ac

(x+2)^2+5(x+2)-6=0
remember order of opertaions
(x+2)(x+2)+5(x+2)-6=0
x^2+4x+4+5x+10-6=0
add like terms
x^2+9x+8=0