Question

1(5x²-7x+2)+(2x²+7x-1)
2(4x+3y+1)+(6x-2y-9)
3(2x³+5x²+4x)+(2x³-3x²+x)
4(4x-y-1)-(9x+y+3)
5(-2a²-3ª+6)-(-4a²-5ª+6)
6(4x³-6x²+3x)-(7x³-6x²+8x)
7 4x(a+b)
8 2x(x²-2x+5)
9 (x+5).(x+2 ​

Answer 1

Resposta:

1(5x²-7x+2)+(2x²+7x-1)

$5 {x}^{2} - 7x + 2 + 2 {x}^{2} + 7x - 1 \\ = 7 {x}^{2} + 1$

2(4x+3y+1)+(6x-2y-9)

$4x + 3y + 1 + 6x - 2y - 9 \\ = 10x - y - 8$

3(2x³+5x²+4x)+(2x³-3x²+x)

$2 {x}^{3} + 5 {x}^{2} + 4x + 2 {x}^{3} - 3 {x}^{2} + x \\ = 4 {x}^{3} + 2 {x}^{2} + 5x$

4(4x-y-1)-(9x+y+3)

$4x - y - 1 - 9x - y - 3 \\ = - 5x - 2y - 4$

5(-2a²-3ª+6)-(-4a²-5ª+6)

$- 2 {a}^{2} - 3 {}^{a} + 6 + 4 {a}^{2} + 5 {}^{a} - 6 \\ = 2 {a}^{2} + 2 {}^{a}$

6(4x³-6x²+3x)-(7x³-6x²+8x)

$4 {x}^{3} - 6 {x}^{2} + 3x - 7 {x}^{3} + 6 {x}^{2} - 8x \\ = - 3 {x}^{3} - 5x$

8 2x(x²-2x+5)

$= 2 {x}^{3} - 4 {x}^{2} + 10x$

9 (x+5).(x+2)

${x}^{2} + 2x + 5x + 10 \\ = {x}^{2} + 7x + 10$