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Home Q & A Board Science-Related Homework Help Mathematics
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12 years ago
16x^3 = x

ive read the text over a million times and it wont give me any information on this certain equation Frowning Face!
if anyone knows how ot solve it could they please tell me how? ez 10 points!!
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wrote...
#1
12 years ago
16x^3 = x
16x^3 - x = 0
x(16x^2 - 1) = 0
x = 0
(16x^2 - 1) = 0
(4x + 1)(4x - 1) = 0
4x + 1 = 0
4x = - 1
x = - 1/4
4x - 1 = 0
4x = 1
x = 1/4

(- 1/4 , 0 , 1/4)
wrote...
#2
12 years ago
You must get the x on them same side of the equation. The right side is 1x. Divide by x.

(16x^3)/x = 1

Simplify.

16x^2 = 1    (when dividing exponets you subtract).

Now divide by the 16.

x^2 = 1/16

Now take the square root.

x = sqrt (1/16)

x= 1/4, -1/4, 0
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