How do you simplify #5^2- 8 ÷ 2# using PEMDAS?

3 Answers
EET-AP
Oct 28, 2017

PEDMAS for #5^2-8-:2=21#

Explanation:

You need to start with the Exponent:

#5^2=25#

Then do the Division:

#8-:2=4#

Then you can Subtract:

#25-4=21#

Jim G.
Oct 28, 2017

#21#

Explanation:

#"following the order of operations as set out in PEMDAS"#

#["Parenthesis (brackets), Exponents (powers),"#
#"Multiplication, Division, Addition, Subtraction "]#

#rArr25-8-:2larrcolor(red)" exponent"#

#=25-4larrcolor(red)"dividion"#

#=21larrcolor(red)"subtraction"#

EZ as pi
Oct 28, 2017

#21#

Explanation:

Identify the individual terms first. There are two terms.

Each term is simplified to a single answer and they are added or subtracted in the last step.

You can simplify in different terms in the same line.

Within each term the order of operations is

  • brackets
  • powers and roots
  • multiply and divide

#" "color(blue)(5^2)color(red)( - 8div2)#

#= color(blue)(25)color(red)( - 4)#

#= 21#

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