How to solve Evaluating functions Linear and quadratic or cubic The functions

[Robertrobson777]

How to solve: g(x) + 2x² -3x Evaluating functions: Linear and quadratic or cubic The functions of G is defined as follows. Find g(-5)?

 

[Otis]

… g(x) + 2x² - 3x … [function g] is defined as follows. Find g(-5)?

Hello Robert. Your post contains an error, but I'm not sure which one.

My guess: The red plus sign above is supposed to be an equals sign. In other words, 2x²-3x is function g's definition.

g(x) = 2x² - 3x

Symbol x is the input variable, and symbol g(x) is the output variable.

When we see g(-5), it means the input variable x has been assigned the value -5. We write g(-5) to represent the output of function g, when the input is -5.

To calculate that output value, we substitute -5 for x everywhere and simplify.

g(-5) = 2(-5)² - 3(-5)

Can you simplify the right-hand side?

PS: If instead you need help evaluating the expression g(x)+2x²-3x when x is -5, then we need the definition for g(x).

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