2x²+x-4=0 by method of complete squares
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(√2x)^2+ 2×x×1/2+ (1/2)^2- (1/2)^2 -4=0
(√2x+1/2)^2=4-1/4
√2x+1/2=√(15/4)
x=√15/2+1/2=√15+1/2÷√2
x=1/2-√15/2÷√2=1-√15÷2√2
(√2x+1/2)^2=4-1/4
√2x+1/2=√(15/4)
x=√15/2+1/2=√15+1/2÷√2
x=1/2-√15/2÷√2=1-√15÷2√2
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