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16-4x²-x=4-4x²
-x=-16+4
-x=-12/:(-1)
x=12
16-4x²-x=4-4x²
-x=-16+4
-x=-12/:(-1)
x=12
16-4x²-x = -(2x-2)(2x+2)
16-4x²-x = -(4x²-4)
-4x²-x = -4x²+4-16
-4x²+4x²-x = -12
-x = -12 |*(-1)
x = 12