Please help me with this problem...
f(x) = 4x^2 - x + 3 ......... find f(-2)
2007-07-10 04:11:26 · 5 answers · asked by Marcela M 1 in Science & Mathematics ➔ Mathematics
f(-2) = 4*(-2)^2 - (-2) +3
f(-2) = 4*(4) - (-2) +3
f(-2) = 16 + 2 + 2
f(-2) = 20
2007-07-10 04:15:52 · answer #1 · answered by c_m_connors 1 · 1⤊ 1⤋
f (- 2) = 4 x 4 + 2 + 3 = 21
2007-07-10 15:50:56 · answer #2 · answered by Como 7 · 0⤊ 0⤋
What you need to do is substitute in a -2 for every 'x' yuou see in the equation.
Therefore,
f(-2)=4(-2)^2 - (-2) + 3
=4(4) + 2 + 3
=16+2+3
=21
2007-07-10 11:19:54 · answer #3 · answered by Kyle K 3 · 0⤊ 0⤋
f(x) = 4x^2 - x + 3 ......... find f(-2)
f(-2) = 4(-2)^2 - (-2) + 3
f(-2) = 16 + 2 +3
f(-2) = 21
QED
2007-07-10 11:17:14 · answer #4 · answered by harry m 6 · 0⤊ 0⤋
just put in -2 everywhere you see x
2007-07-10 11:18:13 · answer #5 · answered by grompfet 5 · 0⤊ 0⤋