Advanced Math practice question

Answer: A. 2x² − 12x + 23

(x − 3)² = x² − 6x + 9, so 2(x − 3)² + 5 = 2x² − 12x + 18 + 5.

Why the other answers are wrong

B. 2x² − 6x + 14

This doubles only the x² term.

C. 2x² + 23

This drops the middle term.

D. 2x² − 12x + 14

This forgets to double the 9 before adding 5.

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