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=(2x²-3x-4) + (x²-4)
=2x²-3x-4+x²-4
=3x²-3x-8
f(x) . g(x)
=(2x²-3x-4) . (x²-4)
=x²(2x²-3x-4) -4(2x²-3x-4)
=2x^4 - 3x^3 - 4x² - 8x² + 12x + 16
=2x^4 - 3x^3 - 12x² + 12x + 16