Question

Someone please answer these. i'm begging haha

Answer 1

5. D

6. A

7. A

Explanation:

5. Perimeter= 2 (length+breadth)

Length=

`x {}^(2) + 7x - 9`

Breadth=

`x {}^(2) - 2x`

`2((x {}^(2) + 7x - 9) + (3x {}^(2) - 2x)) \\ 2x {}^(2) + 14x - 18 + 6x {}^(2) - 4x \\ 2x {}^(2) + 6x {}^(2) + 14x - 4x + - 18 \\ 8x {}^(2) + 10x - 18`

6. Perimeter=

`(7x {}^(2) - 12)+(-5x + 30)+(3x {}^(2)+4x)`

`7x {}^(2) - 12 - 5x + 30 +3x {}^(2) + 4x \\ 7x {}^(2) + 3x {}^(2) - 5x - 4x -12 + 30 \\ 10x {}^(2) - x + 18`

7. 2(x^2+3x-5)-3(2x^2-7x+8)

2x^2+6x-10-6x^2+21x-24

2x^2-6x^2+6x+21x-10-24

-4x^2+27x-34