Answer:
(x+2)2=9
Subtract 9 from both sides of the equation.
(x+2)2−9=0
Simplify
(x+2)2−9
x2+4x+4−9=0
Subtract 9 from 4.
x2+4x−5=0
To write a polynomial in standard form, simplify and then arrange the terms in descending order.
ax2+bx+c=0
The standard form is
x2+4x−5=0
Step-by-step explanation:
