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

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

answer: f true

step-by-step explanation:

nkcoicjc

the surface area is 124cmÂ²

step-by-step explanation:

length: 4cm

width: 9cm

height: 2cm