Question

what should be added to 1 + 2 X + 3 x square to get x square minus x minus 1​

Answer 1

Step-by-step explanation:

let number that should be added = y

1 + 2x+3x^2+y=x^2 -x-1

y = x^2 -3x^2 - x-2x-1-1

y=-2x^2 -x -2

TO CHECK

LHS

1 + 2x+3x^2-2x^2 -x -2

=x^2 -x-1

RHS

x^2 -x-1

LHS = RHS

HENCE VERIFIED

I HOPE IT MAY HELP YOU PLEASE MARK MY ANSWER AS BRAINLIEST