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(x+3y)³ = 1(x³)(3y)⁰ + 3(x²)(3y)¹+ 3(x¹)(3y)²+1(x⁰)(3y)³
(x+3y)³ = x³ + 9x²y + 27xy² + 27y³
2)
(4x-4)(5x+2) = 4x(5x+2) - 4(5x+2)
= 20x² +8 x - 20x - 8
= 20x² - 12x - 8
3)
(x² + 5x +6)/(x + 2) = (x+3)(x+2)/(x+2) = x+ 3