One student did a problem: "given two polynomials A and B, calculate 2A + B“ A classmate did a problem: "given two polynomials A and B, calculate 2A + B". He mistakenly regarded "2A + B" as "a + 2B", and the result was 9x square-2x + 7. Given B = x square + 3x-2, get the correct answer

One student did a problem: "given two polynomials A and B, calculate 2A + B“ A classmate did a problem: "given two polynomials A and B, calculate 2A + B". He mistakenly regarded "2A + B" as "a + 2B", and the result was 9x square-2x + 7. Given B = x square + 3x-2, get the correct answer

A+2B=9X²-2X+7
B=X²+3X-2
A=9X²-2X+7-2B
=9X²-2X+7-2(X²+3X-2)
=7x²-8x+11
Correct answer:
2A+B
=2(7x²-8x+11)+X²+3X-2
=14x²-16x+22+x²+3x-2
=15x²-13x+20

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