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How do I evaluate this function?
Let f(x)=2x - 3 and g(x)=x^2 + 2x + 4. Evaluate f(1) - g(2).
3 Answers
- Ȼԋ ⱥ ᴙ ℓ ϊ ℮Lv 59 years agoFavorite Answer
First, evaluate the functions for x. Imput the x value into the functions.
f(1)=2(1)-3
f(1)=2-3
f(1)= -1
g(2)=(2)^2 + 2(2) + 4
g(2)=4+4+4
g(2) = 12
Now substitute these values into the expression.
f(1) - g(2)
(-1) -(12)
-13
Hope this helps.
- 9 years ago
The question asks you to evaluate the functions where f(x=1) and subtract off g(x=2), so you plug 1 into all x values for the function f(x) and 2 into all x values for g(x). Break it in to 2 parts, one for the function f(x), another for the function g(x)...f(1)=2*1-3 which is -1, g(2)=2^2+2*2+4 which is 12...so f(1)-g(2)= -1-12 = -13
Source(s): I'm an Engineer - Anonymous9 years ago
insert an 1 in f instead of the x and a 2 in g instead of the x
f(1) = 2 -3 -(g(2)=4 +4 +4
= -1 -(12)
=-13