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What is the value of 2x^2+18 when x = -6?

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1 Answer

Hi Chris;
2x2+18
x=-6
2(-6)2+18
Our first priority is the exponential.
(-6)2=(-6)(-6)=36
A negative number multiplied by a negative number results in a positive number.
2(36)+18
Our next priority is the coefficient of 2 as it is multiplied by 36...
72+18
Our last priority is the arithmetic...
90
 
ORDER OF OPERATIONS
Parenthesis---not executed here
Exponential
Multiplication
Division--not executed here
Addition
Subtraction--not executed here
 
The acronym is PEMDAS...
Please Excuse My Dear Aunt Sally
 

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