solve by factorization method :
4x²-7x-2=0
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=> 4x²7x - 2
=> 4x²8x + x - 2 = 0
=> 4x(x2)+1(x - 2) = 0
=> (x - 2) + (4x + 1) = 0
x = 2
x = -1/4
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