Question #17bca

1 Answer
Nov 9, 2016

Answer:

#1427#

Explanation:

When evaluating expressions with #color(blue)"mixed operations"# there is an order which must be followed.

Follow the order as set out in the acronym PEMDAS ( Parenthesis , Exponents, Multiplication, Division, Addition, Subtraction )

#rArr3^6-9^2+5+18xx43#

#=729-81+5+18xx43larrcolor(red)"exponents"#

#=729-81+5+774larrcolor(red)"multiplication"#

Addition and subtraction is now performed from left to right.

#rArr729-81+5+774=1427larrcolor(red)"addition/subtraction"#