-3mn+4m-3 when m=2 and n=-4

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 - M = 2

 - N = -4

 - The reason we multiply first is due to Order of Operations or PEMDAS: Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction.

 - When we see y(x) this just means whatever number or variable is before the parenthesis, you multiply it by that.

Equation at the end of Step 2:

 - We do this once more because we had one last parenthesis.

Equation at the end of step 3:

Equation at the end of Step 4:

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a - base

b - exponent

so,