Question

x = -4, -4 + 4i, -4 - 4i

          x = -4, -4 + 4i, -4 - 4i
        

Added by Jose H.

Elementary and Intermediate Algebra
Elementary and Intermediate Algebra
Alan S. Tussy, R. David Gustafson 5th Edition
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x = -4, -4 + 4i, -4 - 4i
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Transcript

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00:01 Given 4x cubed equals 64x, first subtract 64x to both sides so that we're equal to 0.
00:08 And then we can, greatest common factor 4x, we're left with x squared minus 16 equals 0.
00:14 Well, now we can use difference of squares to say this is 4x times x plus 4 times x minus 4 equals 0...
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