Question

what should be subtracted from 3x³+15x+7 to obtain 7x³-11x²+5x-9?​

Answer 1

Let the number be P

(3x³+15x+7) - P = 7x³-11x²+5x-9

P = (3x³+15x+7) - (7x³-11x²+5x-9)

P = 3x³+15x+7 - 7x³+11x²-5x+9

P = 10x - 4x³ + 11x² + 16

P = - 4x³ + 11x² + 10x + 16

Answer 2

ans 10x³-11x2+20x-2

add both the equations