The profits od a company are found by subtracting the company's costs from its revenue. If a company's cost is mode by x^2-3x+400 and its revenue is modeled by 4x^2-7x-900, what is an expression for the profits?
x^2-3x+400-(4x^2-7x-900)
= x^2-3x+400-4x^2+7x+900
= -3x^2+4x+1300
+24 
