Question

Answer 1

`@` `\text {Ans}`

`\downarrow`

`3)`

`(3x-5)(2x+11) - (2x+3)(3x+7)`

`= 3x(2x+11) - 5(2x+11) - [ 2x(3x+7) + 3(3x+7)]`

`= 6x^2 + 33x - 10x - 55 - (6x^2 + 14x + 9x + 21)`

`= 6x^2 + 23x - 55 - (6x^2 +23x + 21)`

`= 6x^2 + 23x - 55 - 6x^2 - 23x - 21`

`= -76`

`4)`

`x(x^2 + x + 1) - x^2(x+1) - x + 5`

`= x^3 + x^2 + x - x^3 - x^2 - x + 5`

`= (x^3 - x^3) + (x^2 - x^2) + (x - x) + 5`

`= 5`

`@` `\text {Kaizuu lv uuu}`