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4x² ≠ 1 / ÷4
x² ≠ ¼
x ≠ √¼
x≠ ½ lub x≠ - ½
czyli x ∈ {-½ , ½}
dla x= -1
x²+x-2 ÷ 4x²-1 = (-1)²+(-1)-2 ÷ 4*(-1)²-1 = 1-1-2÷4-1 = -2÷3 = -⅔