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8090 [49]
4 years ago
12

If x2=100 then x2-x=?

Mathematics
2 answers:
Norma-Jean [14]4 years ago
7 0
X² = 100
x² -x = ?
As x² = 100 = 10², it means x =10
So,  x² - x = 100 - x = 90
90 is the answer.
lesya [120]4 years ago
6 0
For this case we have the following expression:
 x^2=100
 From here we clear x, obtaining two possible results:
 x = +/- \sqrt{100}
 x1=+\sqrt{100}=10
 x2=-\sqrt{100}=-10
 Therefore we must evaluate the second expression for both values of x:
 
 For x = 10:
 
x^2-x=(10)^2-10

x^2-x= 100-10

x^2-x=90

 For x = -10
 
x^2-x=(-10)^2-(-10) 

x^2-x= 100+10

 x^2-x=110
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