Question

What must be added to 5x³ - 2X² + 6 X + 7 to make the sum x³ + 3x² - x + 1?​

Answer 1

Answer:

-4x³ +5x² - 7x -6

Step-by-step explanation:

5x³-2x²+6x+7 must be subtracted from x³+3x²-x+1

 x³ + 3x² -   x +  1

5x³ - 2x² + 6x + 7

-4x³ +5x² - 7x -6

Answer 2

To find the required number

Let it be n

so,

n=5x³-2x²+6x+7-x³+3x²-x+1

=5x³-x³-2x²+3x²+6x-x+7+1

=4x³+x²+5x+8

hence , 4x³+x²+5x+8 is answer