Question

15. What polynomial must be added to .x^2-2x+ 6 so that the sum is 3x^2+ 7x ?

Answer 1

Answer:

$2x^2+9x-6$

Step-by-step explanation:

Just subtract the two because x + y = z and z-x = y

$3x^2+7x-(x^2-2x+6) = 3x^2+7x-x^2+2x-6\\\\=2x^2+9x-6$

You can test this by adding this expression back to the original.

$x^2-2x+6+(2x^2+9x-6) = 3x^2+7x$