m^2+20m-91=4

Completing the square
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1 Answer

m2+20m-91=4,

m2+20m=95, complete the square for the LHS:

m2+20m+100=100+95=195,

(m+10)2=195, take the square root of each side:

m+10=±√195=±13.96424 approx,

m=-10±13.96424, so m=3.96424 or -23.96424.

by Top Rated User (1.2m points)

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