Which function models the area of a rectangle with side lengths of 2x – 4 units and x + 1 units? A. f(x) = 2x2 – 4x + 4 B. f(x) = 2x2 + 8x – 4 C. f(x) = 2x2 – 8x + 4 D. f(x) = 2x2 − 2x − 4

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the answer is 21%.

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answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb