Add 49 to both sides.
What does n equal?
what is the solution of n^2-49=0
-7
7
±7
no solution
4 answers
n^2-49=0;
expand to (n-7)(n+7)=0;
thus, n-7=0 or n+7=0; n=7 and n=-7
------------------------
n^2-49=0;
n^2=49
n=± sqrt(49)
expand to (n-7)(n+7)=0;
thus, n-7=0 or n+7=0; n=7 and n=-7
------------------------
n^2-49=0;
n^2=49
n=± sqrt(49)
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9 answers