Find f(5) if f(x)= …

Miss L. asks:

“Find f(5) if f(x)=x^2-3x

Solving:

f(5)=(5)^{2}-3(5)

Expand the exponent (2) to the expression.
Squaring a number is the same as multiplying the number by itself (5*5). In this case, 5 squared is 25.
f(5)=(25)-3(5)

Multiply -3 by each term inside the parentheses.
f(5)=25-15

Subtract 15 from 25 to get 10.
f(5)=10

Put down your stakes!

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