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(1) 0.4x^2-0.5x=1
4x²-5x=10
x²-5x/4=5/2
x²-5x/4+25/64=5/2+25/64
(x-5/8)²=185/64
x=5/8+√185/8 x=5/8-√185/8
(2) (2x-1)(x+2)=1
2x²+3x=3
x²+3x/2+9/16=3/2+9/16
(x+3/4)²=33/16
x=-3/4+√33/4 x=-3/4-√33/4
4x²-5x=10
x²-5x/4=5/2
x²-5x/4+25/64=5/2+25/64
(x-5/8)²=185/64
x=5/8+√185/8 x=5/8-√185/8
(2) (2x-1)(x+2)=1
2x²+3x=3
x²+3x/2+9/16=3/2+9/16
(x+3/4)²=33/16
x=-3/4+√33/4 x=-3/4-√33/4
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