Evaluate Given a Value for a Variable

Evaluate the expression for the given value of the variable:
2x³ for x=3

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Evaluate the expression: x + 2 when x = 6

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What is the first thing you do when evaluating an expression

• Substitute value in for the variable

• Combine like terms

• Parenthesis

3x + 8   if x = 2

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Evaluate expression if a=3 and b=4

4b-5a

• 2

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• -8

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Evaluate expression if a=3 and b=4

18 ÷ 2a

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• 2.25

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Evaluate 2a + 4b 
if a = 10     and    b = 6

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Evaluate n + 5² for n=3

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• 8

• 25

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What is 4x if x=5?

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• 16

• 9

• 45

Evaluate 5y + 2 if       y = 3

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• 55

• 13