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https://web2.0calc.com/questions/math-questi0n#r1
f(x) = 9x3 + 2x2 - 5x + 4 g(x) = 5x3 - 7x + 4
f(x) - g(x) = ( 9x3 + 2x2 - 5x + 4 ) - ( 5x3 - 7x + 4 ) = 9x3 + 2x2 - 5x + 4 - 5x3 + 7x - 4 = 4x3 + 2x2 + 2x