Question

What must be added to 7x2–8x–3 to obtain 9x2–4x–11?​

Answer 1

Step-by-step explanation:

$9x^{2} -4x-11-(7x^{2} -8x-3)=9x^{2} -4x-11-7x^{2} +8x+3$

=$9x^{2} -7x^{2} -4x+8x-11+3=2x^{2} +4x-8$

Therefore $2x^{2} +4x-8$ must be added to $7x^{2} -8x-3$ to obtain $9x^{2} -4x-11$.

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