Asked by Linda

Find the real-number solution of the equation. 3x^7 = 81x^4

I got this far...
3x^7 - 81x^4 = 0
x^4 (3x^3 - 81) = 0
Answered by Dr Russ
3x^7 = 81x^4

divided both sides by 3

x^7 = 27x^4

divided both sides by x^4

x^3 = 27

take the cube root of each side

x=3



Answered by Reiny
or
x = 0

since ....
x&7 - 27x^4 = 0
x^4 (x^3 - 27) = 0
x^4 = 0 or x^3 = 27
x = 0 or x = 3
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