SOLUTION: i am stuck can anyone solve it please....|x^2-x-20|=0

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Question 926548: i am stuck can anyone solve it please....|x^2-x-20|=0
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

abs%28x%5E2-x-20%29=0
same as sqrt%28x%5E2-x-20%29%5E2%29=0
so, x%5E2-x-20=0 or -%28x%5E2-x-20%29=0=>-x%5E2%2Bx%2B20=0=>0=x%5E2-x-20
if x%5E2-x-20=0 =>
x%5E2%2B4x-5x-20=0
%28x%5E2%2B4x%29-%285x%2B20%29=0
x%28x%2B4%29-5%28x%2B4%29=0
%28x-5%29%28x%2B4%29+=+0
if %28x-5%29=+0=>x=+5
if %28x%2B4%29=+0=>x=-4


+graph%28+600%2C+600%2C+-10%2C10%2C+-10%2C+30%2C+abs%28x%5E2-x-20%29%29+