SOLUTION: Find the approximate value of x: {{{sqrt(81-x^2)=3}}}

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Question 140338: Find the approximate value of x: sqrt%2881-x%5E2%29=3
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%2881-x%5E2%29=3 Start with the given equation


81-x%5E2=9 Square both sides


-x%5E2=-72 Subtract 81 from both sides


x%5E2=72 Divide both sides by -1


x=0%2B-sqrt%2872%29 Take the square root of both sides


x=6%2Asqrt%282%29 or x=-6%2Asqrt%282%29 Simplify


x=8.48528 or x=-8.48528 Approximate by using a calculator


So the approximate value of x is x=8.48528 or x=-8.48528