30. The equation below represents the quadratic function where a and b are constants. If the function is graphedin the coordinate plane, its vertex

30. The equation below represents the quadratic function where a and b are constants. If the function is graphed in the coordinate plane, its vertex is at the point (2.-54). What is the value of a + b?
f(x) = a(x + b)(x-8)
A 4
B. 3.3
C. 6
D. 73

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This Post Has 4 Comments

  1. hello from mrbilldoesmath!

    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

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