Question

Answer 1

8) \(\left(1-5x\right)^2=1^2-2.1.5x+\left(5x\right)^2=1-10x+25x^2\)

9) \(\left(2+3x\right)^2=2^2+2.2.3x+\left(3x\right)^2=4+12x+9x^2\)

10) \(\left(2x+y\right)^2=\left(2x\right)^2+2.2x.y+y^2=4x^2+4xy+y^2\)

Answer 2

8. (1 - 5x)²

= 1 - 10x + 25x²

9. (2 + 3x)²

= 4 + 12x + 9x²

10. (2x + y)²

= 4x² + 4xy + y²

Answer 3

8) (1 - 5x)² = 1² - 2.1.5x + (5x)² = 1 - 10x + 25x² 

9) (2 + 3x)² = 2² + 2.2.3x + (3x)² = 4 + 12x + 9x²

10) (2x + y)² = (2x)² + 2.2x.y + y² = 4x + 4xy + y²