Question

(2x-1)² -(x+2)= -2x​

Answer 1

(2x-1).(2x-1) - (x+2)= -2x

4x²-2x -2x +1 -(x+2)= -2x

4x²+4x+1 -x -2 = -2x

4x² +3x -1 = -2x

4x² + 3x -2x -1 = 0

4x² + x -1 = 0

Δ=b²-4.a.c

Δ= 1² -4.4.(-1)

Δ=1+16

Δ= 17

x=(-b+/-√Δ) : 2a

x=(-1+/- √17) : 2.4

x=(-1+/- 4,1) : 8

x'=0.3875

x"= 0.6375

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