 # Evaluate Expressions with Variables | Find the Value of an Expression

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To math with mr j in this video. Were going to be finding the the value of an expression given the value of the variable. So we have four that were going to go through together in order to get this down.
So lets jump right in the number one here. Where we have three plus m. If m.
Equals. Eight. So we would read this find the value of the expression.
Three plus m. If m equals. Eight.
So that m. Within our expression. Is our variable our missing piece.
Well we are given what the value or how much that m.

Is worth right here m equals. 8. So in order to solve we need to plug that a in for the m.
So we would have 3 plus. 8. And now were able to solve and that will give us the answer or value of the expression and 3 plus.
8. Equals. 11.
So thats our value or answer to number one number two we have 10 a minus 3. So find the value of the expression. 10a minus 3.
If a equals 2. So right here. Where we have a number right next to a letter.
Whenever you see that that means multiplications.

So that means 10 times a or 10 times. The value of a so lets rewrite our problem. With 2 plugged in for a so 10 times 2 minus.
3. And now were able to solve. So its just order of operations.
Which multiplication comes before subtraction so 10 times. 2. Is 20 bring down our subtract.
3. And we get 220 minus. 3.
Which is 17 number three we have w. Squared minus eight. So find the value of the expression.
W.

Squared. Minus. Eight if w equals.
Seven. So again we need to plug in the value of our variable. Which in this case.
Its a seven so we have seven squared minus eight. So now were ready to solve so order of operations exponents comes before subtraction seven squared does not mean seven times two remember. An exponent means to expand that seven out twice and multiply so it means.
7 times. 7. Which is 49 bring down our minus eight.
And we get to 49 minus. 8. Which equals 41.
And lastly number four here.