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OpenStudy (anonymous):
Solve: 25n^2-4=0
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OpenStudy (anonymous):
each of the numbers is a perfect square so use DOTS (5x-2)(5x+2)=0 5x-2=0 5x=2 x=2/5 5x+2=0 5x=-2 x=-2/5
OpenStudy (anonymous):
25n^2-4=0 25n^2=4 n^2=4/25 n=squareroot(4/25) n=2/5 or 0.4
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