Question

What is the resulting ordered pair if the value of the independent variable is –2?
2003-08-02-00-00_files/i0290000.jpg
A.
(–5, –2)
B.
(–2, –4)
C.
(–2, –28)
D.
(–4, –2)

Answer 1

f(x) = 2x^3 + 3x^2

since the independent variable (which we wil treat as x) is -2, the first coordinate in the pair must be -2, automatically leaving us with answers B+C as possibilities.

to figure out the second coordinate, simply plug in x = -2 into the function and evaluate. be very careful with signs and exponents.