SOLUTION: Please help me solve this equation:{{{ x= sqrt ( x+20 ) }}}.
what i have tried is squaring both sides to where i get{{{ x^2=x+20 }}}
the i subtracted the {{{ x^2-x=20 }}}
the
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Question 566930: Please help me solve this equation:.
what i have tried is squaring both sides to where i get
the i subtracted the
the answer i got was but my teacher said it was wrong
he has said the correct answer is what did i do wrong?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
How'd you get x=20 from x^2 - x = 20?
You should also subtract the 20, so your equation will look something like
, this factors to
(x+4) = 0)
, so x = 5 or x = -4. Since we have a square root, we should check to make sure our solutions actually work. x = 5 definitely works, x = -4 probably won't since the square root usually denotes only the positive root. The solution 13/12 is wrong.
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