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Multiple Choice
Factor completely.
A
(2x+3)(x+3)
B
(2x+3)(x−3)
C
(x+3)(2x−3)
D
(x−3)(2x−3)
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1
Identify the quadratic expression to factor: \(2x^2 + 9x + 9\).
Multiply the coefficient of \(x^2\) (which is 2) by the constant term (which is 9) to get \(2 \times 9 = 18\).
Find two numbers that multiply to 18 and add up to the middle coefficient, 9. These numbers are 6 and 3.
Rewrite the middle term \$9x$ as \(6x + 3x\), so the expression becomes \(2x^2 + 6x + 3x + 9\).
Group the terms in pairs and factor each group: \(2x^2 + 6x\) factors to \(2x(x + 3)\), and \(3x + 9\) factors to \(3(x + 3)\). Then factor out the common binomial \((x + 3)\) to get \((2x + 3)(x + 3)\).