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Advanced Math / Nonlinear functions Difficulty: Hard

The function f gives the product of a number, x , and a number that is 91 more than x . Which equation defines f ?

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Explanation

Choice C is correct. It’s given that the function f gives the product of a number, x, and a number that is 91 more than x. A number that is 91 more than x can be represented by the expression x+91. Therefore, f can be defined by the equation f(x)=x(x+91), or f(x)=x2+91x.

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice D is incorrect and may result from conceptual or calculation errors.