Question

x(3+2x) +x2(1+2x)
expand the brackets and simplify

Answer 1

$= x(3 + 2x) + {x}^{2} (1 + 2x) \\ \\ = 3x + 2 {x}^{2} + {x}^{2} + 2{x}^{3} \\ \\ = 2 {x}^{3} + 3 {x}^{2} + 3x$