Thread: Order of Operations Problem(s)

5y^2 + y + 1; y=4

So...

5(4)^2 + 4 + 1

I'm not sure if I am supposed to multiply the 5(4) before I square root it.

5(4)^2 + 4 + 1
= 20^2 + 4 + 1
= 400 + 4 + 1
= 405

Did I work the problem correctly?

Parentheses-Exponents-Multiplication-Division-Addition-Subtraction

Originally Posted by Melancholy

5y^2 + y + 1; y=4

So...

5(4)^2 + 4 + 1

I'm not sure if I am supposed to multiply the 5(4) before I square root it.

5(4)^2 + 4 + 1
= 20^2 + 4 + 1
= 400 + 4 + 1
= 405

Did I work the problem correctly?

Parentheses-Exponents-Multiplication-Division-Addition-Subtraction

Exponents have a higher precedence than multiplication.

You would need to square 4 first, and then multiply by 5:



--Chris

Ahhh, thank you very much, Chris. I kept thinking that the parentheses around the four came first since they are, afterall, first on the "pemdas" list. Guess I need to do some serious review on my stuff before Algebra II this year, eh? ^_^

<3