Question

a)3x.(5x²+3x-1)
B) 2x²(5x-1)

A)(2x+3)(5x-1)
B)(x-3)(x+3)(x²+9)

Answer 1

A)3x.(5x²+3x-1)
15X³ + 9X² - 3X

B) 2x²(5x-1)
10X³ - 2X²

A)(2x+3)(5x-1)
10X² - 2X +15X - 3
10x² + 13x -3

B)(x-3)(x+3)(x²+9)
X² + 3X -3X - 9.(X² + 9)
X² - 9 (X² + 9)
$x^{4}+ 9x^{2} - 9 x^{2} -81 \\ \\ x^{4} -81$