subtract 3x + 4x² - 7 from x⁴ + 3x² - 4x + 4
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(x⁴ + 3x² - 4x + 4) -(3x + 4x² - 7 )
=x⁴+ (3x²-4x²)+(-3x-4x)+(7+4)
=x⁴-x²-7x+11
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