2007-07-04 09:11:25 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
-25
Plug in -3 for x
-2(-3)^3-8(-3)^2+2(-3)-1
Perform Exponents first
-2(-27)-8(9)+2(-3)-1
Simplify
54-72-6-1=-25
2007-07-04 09:13:53 · answer #1 · answered by desgard 4 · 1⤊ 0⤋
Hey there!
Here's the answer.
f(x)=-2x^3-8x^2+2x-1 -->
f(-3)=-2(-3)^3-8(-3)^2+2(-3)-1 -->
f(-3)=-2(-27)-8(9)-6-1 -->
f(-3)=54-72-6-1 -->
f(-3)=-18-7 -->
f(-3)=-25
Basically you substitute the value of 3 for x into the function equation. So the answer is f(-3)=-25.
Hope it helps!
2007-07-04 17:25:54 · answer #2 · answered by ? 6 · 0⤊ 0⤋
f(-3) = -2(-3 x -3 x -3) -8(-3 x -3) + 2(-3) -1
= -2(-27) -8(9) +2(-3) -1
= 54 -72 + -6 -1
= 54 -79
= -25
2007-07-04 16:19:17 · answer #3 · answered by my 2 cents 4 · 0⤊ 0⤋
-2(-3)^3-8(-3)^2+2(-3)-1= -25
2007-07-04 16:19:03 · answer #4 · answered by GB 2 · 0⤊ 0⤋
substitue for x and solve silly
-2(-3)^3 - 8(-3)^2 +2(-3) -1
-2(-27) -8(9) -6-1
2007-07-04 16:15:20 · answer #5 · answered by ninesunz 3 · 0⤊ 0⤋
Plug in -3 wherever you see "x."
So:
f(-3)= -2(-3)^3-8(-3)^2+2(-3)-1
f(-3)= -25
Hope this helps!
2007-07-04 16:21:57 · answer #6 · answered by WarriorChik724 1 · 0⤊ 0⤋
f(x)=-2x^3-8x^2+2x-1
f(-3)=+54-72-6-1=-25. answer
2007-07-04 16:15:47 · answer #7 · answered by Anonymous · 0⤊ 0⤋
f(- 3) = (- 2).(- 3)³ - 8.(- 3)² + 2.(- 3) - 1
f(- 3) = 54 - 72 - 6 - 1
f(- 3) = - 25
2007-07-04 17:20:52 · answer #8 · answered by Como 7 · 0⤊ 0⤋
-25
2007-07-04 16:18:03 · answer #9 · answered by mathewqarlati 1 · 0⤊ 0⤋
-2(-3)^3-8(-3)^2+2(-3)-1=
-2(-27)-8(9)-6-1=
54-72-7=
54-79=
-25
2007-07-04 16:14:47 · answer #10 · answered by venomfx 4 · 0⤊ 0⤋