Question

7. What should be added to 1+2x-3x² to
get x²-x-1​

Answer 1

Answer:

$4$$x^{2}$$-3x-2$

Step-by-step explanation:

$x^{2} -x-1-(1+2x-3x)= x^{2} -x-1-1-2x+3x^{2} = x^{2} +3x^{2} -x-2x-1-1= 4x^{2} -3x-2$