X²+x-20=0 solve by completing the square method
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=X^2+X=20
X+1/2*2*X+(1/2)^2=20+1/2^2
(X+1/2)^2=81/4
X+1/2=+OR-9/2
X=10/2=5
X=-8/2=-4
X+1/2*2*X+(1/2)^2=20+1/2^2
(X+1/2)^2=81/4
X+1/2=+OR-9/2
X=10/2=5
X=-8/2=-4
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