Question

b)(x+3)(x-3)=5-(x+2)(x-2)

Answer 1

x^2-3x+3x-9=5-x^2-2x+2x-4
x^2-9=5-x^2-4
x^2-9-5+x^2+4=
x^2-14+x^2+4=
x^2+x^2-10=
2x^2-10=x^2(1-10)
-9x^2=0
x^2=$\sqrt{9}$
x=3

Answer 2

x la a doua -9=5-x la a doua +4
2x la a doua =18
x la a doua=9
x=3