algebra 2
Posted by hellogoodbie on Saturday, January 16, 2010 at 3:24pm.
Posted by hellogoodbie on Saturday, January 16, 2010 at 2:59pm.
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
algebra 2 - drwls, Saturday, January 16, 2010 at 3:02pm
The answer has to be an integer. In this case, it is 2*4 - 8*(-2) - 3 = 21
algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 3:06pm
where did u get the 4 from?
algebra 2 - bobpursley, Saturday, January 16, 2010 at 3:45pm
The four came from (x2)
two squared is 4
algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 3:49pm
Wow, I'm so confused. Can somebody just solve this problem step by step please?
Reply
Answers
Given the function f(x) = 2x^2 - 8x - 3, the value for f(-2) can be found as follows: Start with the function f(x) and substitute -2 for x. f(-2) = 2(-2)^2 - 8(-2) - 3 Use the Order of Operations to solve the equation. f(-2) = 2(-4) - (-16) - 3 Multiply 2 by -4 f(-2) = -8 - (-16) - 3 Add -16 and -3 f(-2) = -8 - (-19) Add -8 and -19 f(-2) = -27 Therefore, f(-2) equals -27.
