Question

subtract -7x³+8x²+5x-2from 9x³-2x²-7x+4​

Answer 1

Answer:

$(9 {x}^{3} - 2 {x}^{2} - 7x + 4) - ( - 7 {x}^{3} + \\ 8 {x}^{2} + 5x - 2) \\ = 9 {x}^{3} - 2 {x}^{2} - 7x + 4 + 7 {x}^{3} - \\ 8 {x}^{2} - 5x + 2 \\ = 16 {x}^{3} - 10 {x}^{2} - 12x + 6$

Answer 2

Step-by-step explanation:

$9x ^{3} - 2x ^{2} - 7x + 4 \\ - 7x ^{3} + 8x ^{2} + 5x - 2 \\ - - - - - - - - - - \\ + \: \: \: \: \: \: \: - \: \: \: \: \: \: \: - \: \: \: \: \: \: \: + \\ 2x {}^{3} - 10x {}^{2} - 2x + 2$

by elimination method