Question

what should be added to 1+2x-3x square to get x square -x-1

Answer 1

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Answer 2

So, If we add $4x^{2} -3x-2$ with $1+2x-3x^{2}$ then get $x^{2} -x-1$

Step-by-step explanation:

Given;

What should be added to $1+2x-3x^{2}$ to get  $x^{2} -x-1$

Let,

If we add $a$ with $1+2x-3x^{2}$ then get $x^{2} -x-1$

∴$a+1+2x-3x^{2}=x^{2} -x-1$

⇒$a=x^{2} -x-1-1-2x+3x^{2}$

⇒$a=4x^{2} -3x-2$

∴ If we add $4x^{2} -3x-2$ with $1+2x-3x^{2}$ then get $x^{2} -x-1$