Question

2x²+x-4=0 by method of complete squares

Answer 1

(√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