Question

(x+1)²-3(x+7)=3+(x-2)²
(3x-1)²-5(x+2)(x-2)=(2x+3)²+6
(x+2)²/6-(x-2)²/5=4x+7/15-(x-2)(x+2)-5/30

Answer 1

a) $x^{2}$+2x+1 -3x-21=3+$x^{2}$-4x+4
$x^{2}$-x-20=7+$x^{2}$-4x
$x^{2}$-$x^{2}$-x+4x=7+20
3x=27
x=9

b)$9x^{2}$-6x+1-5($x^{2}$-4)=$4x^{2}$+12x+9+6
$9x^{2}$-6x+1-$5x^{2}$+20=$4x^{2}$+12x+15
$-4x^{2}$-6x+21=$4x^{2}$+12x+15
$-4x^{2}$-$4x^{2}$-6x-12x=15-21
-18x=-6
18x=6
x=3