Question

resolva as equações:
a) (x-4)²= x²-40

b) 4 (x+2)²=(2x-3)²

Answer 1

a)
x²+16=x²-40
x²-x²=-40-16
0=-56

b)
4(x+2)²=(2x-3)²
4(x²+4)=2x²+9
4x²+16=2x²+9
4x²-2x²=9-16
2(2x²)-(2x²)=9-16
2=9-16
2=7