khefkwhlmwqb
khefkwhlmwqb
21-04-2017
Mathematics
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solve 3x^2-27=0 using square roots
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Аноним
Аноним
21-04-2017
3x^2-27=0
3x^2 = 27
x^2 = 9
x^2 = +- 3
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irspow
irspow
21-04-2017
3x^2-27=0
3(x^2-9)=0 notice the difference of squares in the parentheses...
3(x+3)(x-3)=0
so x=±3 which means x=-3 or 3
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