How Do You Evaluate an Algebraic Expression by Plugging In Values?

We are given an expression with a's and b's, and we need to figure out the value of that expression!
We know that 'a' = 30, and 'b' = 10
What is the value of our expression?

1. Remember that 'a' is a variable here whose value we are given, its value is 30
1. Remember that 'b' is a variable here whose value we are given, its value is 10
1. This is what the equation looks like once we have plugged in our numbers for the variables 'a' and 'b'
1. This is what the equation looks like once we have plugged in our numbers for the variables 'a' and 'b'
2. The first step is to evaluate the power, 10²
3. 10² is 10 times 10, which is 100
1. Now we perform multiplication:
2. 4 times 30 is 120
3. 10 times 10 is 100
4. One half of 100 is 50
5. The last thing we do is add everything together

Evaluate the following expression if a=30 and b=10.4a + 10b + (1/2)b2