Given f(x) = 5x2 – 3x + 1, find f(–2)
2007-02-24 17:39:43 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
just plug -2 in for x....also, dont use x to signify muliplication any longer, use * instead.....
5*2-3(-2)+1 = 10+6+1=17
2007-02-24 17:44:31 · answer #1 · answered by n_d_metcalf 2 · 0⤊ 0⤋
f(2) = 5(-2)^2 - 3(-2) + 1 = 5(4) + 6 + 1 = 27
2007-02-25 01:52:23 · answer #2 · answered by kellenraid 6 · 0⤊ 0⤋
27
2007-02-25 02:15:53 · answer #3 · answered by Physibiochemist 2 · 0⤊ 0⤋
I'm guessing the first term is actually "5 x-squared", not "five x, two" or "five times two." The standard way to write it without using superscript (the miniature character used to denote "to the power of ") is like this:
f(x) = 5x^2 - 3x + 1 (x^2 means "x to the power of 2" or x-squared.)
To find f(-2) you just substitute (-2) everywhere x appears:
f(-2) = 5[(-2)^2] -3(-2) +1
Then simplify, keeping in mind the order of operations: exponents first, then multiplication and division, then addition and subtraction last.
Hope that helps, good luck.
2007-02-25 02:10:00 · answer #4 · answered by fugwbck 2 · 0⤊ 0⤋
27
so easy also to child!!!
2007-02-25 01:52:33 · answer #5 · answered by Anonymous · 0⤊ 0⤋
27
Doug
2007-02-25 01:45:27 · answer #6 · answered by doug_donaghue 7 · 0⤊ 0⤋