Question

Solve the polynomial equation by factoring. $x^4-81=0$ 

   Solve the polynomial equation by factoring.
$x^4-81=0$
Calculus for dummies: 1,001 calculus practice problems
Calculus for dummies: 1,001 calculus practice problems
Patrick Jones 1st Edition
Chapter 1, Problem 47 ↓
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Solve the polynomial equation by factoring. $x^4-81=0$
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Transcript

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00:01 We need to factor completely.
00:02 So we're going to have the square root of x to the fourth power, which is x squared, the square root of 81, which is 9.
00:09 So we're going to use difference of squares.
00:10 So we have x squared plus 9 and then x squared minus 9...
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