Question

a) ( x-3) (x²+5x+6)

b) ( 4y+5 ) (2y²- 3y + 6 )

Answer 1

Ola 

a) (x - 3)*(x² + 5x + 6) = x³ + 2x² - 9x - 18
b) (4y + 5)*(2y² - 3y + 6) = 8y³ - 2y² + 9y + 30

Answer 2

$a)\\(x-3)(x^2+5x+6)=\\x(x^2+5x+6)-3(x^2+5x+6)=\\x^3+5x^2+6x-3x^2-15x-18=\\\boxed{x^3+2x^2-9x-18}\\\\b)\\(4y+5)(2y^2-3y+6)=\\4y(2y^2-3y+6)+5(2y^2-3y+6)=\\8y^3-12y^2+24y+10y^2-15y+30=\\\boxed{8y^3-2y^2+9y+30}$