Question

a, (3x + 4)² + (4x - 1)² + (2 + 5x)(2 - 5x)

b, 3x (x - 4) - x (5 + 3x) 

Answer 1

`a, = 9x^2 + 24x + 16 + 16x^2 - 8x + 1 + 4 - 25x^2`

`= 16x +21`

`b, 3x^2 - 12x - 5x - 3x^2`

`= -17x`

Answer 2

a) (3x + 4)² + (4x - 1)² + (2 + 5x)(2 - 5x)

= 9x² + 24x + 16 + 16x² - 8x + 1 + 4 - 25x²

= 16x + 21

b) 3x(x - 4) - x(5 + 3x)

= 3x² - 12x - 5x - 3x²

= -17x²