Question

simplify x³-3x²+7x-5+2x³-9x²+3-x find the value of x=-3​

Answer 1

$3 {x}^{3} - 12 {x}^{2} + 6x - 2$

$3( { - 3}^{3} ) - 12( { - 3}^{2}) + 6( - 3) - 2$

$3( - 27) - 12(9) - 18 - 2$

$81 - 108 - 18 - 2$

$81 - 128$

$answer = 47$