How is this problem done?
IF f(x)=2x^2-8x-3 FIND f(-2)
algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm
Put in for x the value -2, and compute f(-2)
algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 1:47pm
so is the answer f=21/2? if that is right, thank you bobpursley
The answer has to be an integer. In this case, it is 2*4 - 8*(-2) - 3 = 21
where did u get the 4 from?
x^2 = 4
To find the solution to this problem, you need to substitute the value -2 into the function f(x) and then compute f(-2). Here's how you can do it:
1. Start with the function f(x) = 2x^2 - 8x - 3.
2. Substitute -2 in place of x in the function to get f(-2): f(-2) = 2(-2)^2 - 8(-2) - 3.
3. Simplify the expression: f(-2) = 2(4) + 16 - 3 = 8 + 16 - 3 = 24 - 3 = 21.
4. So the answer to the problem is f(-2) = 21.
It seems there was a mistake in the previous response where the answer was given as f = 21/2. The correct answer is f(-2) = 21.