Find the value of the polynomial x^3-4x when x=-2
2007-12-20 18:19:11 · 6 answers · asked by Cindy F 3 in Science & Mathematics ➔ Mathematics
x^3 - 4x
= -8 - (-8)
= -8 + 8
= 0
2007-12-20 19:49:14 · answer #1 · answered by An ESL Learner 7 · 0⤊ 0⤋
Substitute -2 for x in the equation:
-2^3-4(-2)
-2^3 = -2*-2*-2 = -8
-4(-2)=8
So the answer is:
-8+8=0
2007-12-21 02:29:21 · answer #2 · answered by SongDuck 3 · 0⤊ 0⤋
-2 cubed = -2 x -2 x -2 = -8
-4 x -2 = 8
(-2)^3 -4 (-2) = 0
-8 + 8 = 0
2007-12-21 02:26:57 · answer #3 · answered by Stephen Y 6 · 0⤊ 0⤋
replace x by -2
-2^3-4(-2)
-8+8
0
2007-12-21 02:24:17 · answer #4 · answered by cinash 2 · 0⤊ 0⤋
= 123
2007-12-21 02:21:43 · answer #5 · answered by Anonymous · 0⤊ 0⤋
-8 + 8 = 0
0
2007-12-21 02:21:58 · answer #6 · answered by b1gmuff 3 · 1⤊ 0⤋