Question

(m+3)² - 2(m-5)

(x-5)² - 3(x-2)²

3(y+2) - y(y-7)+(y-3)²

(x-6)(x+2) - (x-2)²+(x-1)(x+1)

Answer 1

Vamos lá: (m+3) (m+3) - 2m-10 =  m²+3m+3m+9-2m-10 =  m²+4m+9

- 3y+6 - y²-7-y²-6y+9=  -2y²-9y-8

x²+2x-6x-12- (x-2) (x-2) + x²+x-x-1
x²-4x-12-x²-4x+4+x²-1
x²+8x-13

(x-5) (x-5) - (3x-6)²
x²-10x+25 - (3x-6) (3x-6)
x²-10x+25 - 9x²-18x-18x+36
-8x²-46x+61

Resposta final:

1- m²+4m+9
2 - -8x²-46x+61
3- -2y²-9y-8
4 - x²+8x-13