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What is the simplified form of (6a^2-4a+9-2a^2+7a-5)?

Answer and explanation

Correct answer: (4a^2+3a+4)

Direct answer: Option B, \\(4a^2+3a+4\\). To simplify a polynomial, combine only like terms: terms with the same variable and the same power. First collect the squared terms: \\(6a^2-2a^2=(6-2)a^2=4a^2\\). Next collect the terms containing a: \\(-4a+7a=(-4+7)a=3a\\). Finally combine constants: \\(9-5=4\\). Therefore the simplified expression is \\(4a^2+3a+4\\). Option A, \\(8a^2+3a+4\\), incorrectly adds the coefficients 6 and 2 instead of subtracting because the second squared term is negative. Option B is correct. Option C, \\(4a^2-11a+14\\), uses incorrect signs and combines unlike numerical parts. Option D, \\(8a^2-11a+4\\), has both the wrong squared-term coefficient and the wrong linear coefficient. The power of a term must not be changed while combining it. Memory cue: group by power: squared terms, first-power terms, then constants.

Related tags

Algebraic ExpressionsHardLike Terms

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