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Evaluate the Expression 3x(2x-7)











































When evaluating an algebraic expression, remember that letters stand for numbers.

Evaluate the expression below by substituting the numerical value of x.

3x(2x-7) when x = 5

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Mar 05, 2013
Evaluate
by: Staff


Answer

Part I


Substitute the number 5 for every x in the expression.

Substitute the number 5 for every x in the expression




Evaluate the expression using the PEMDAS order of operations


PEMDAS order tells you what to do first, second, . . . etc.

PEMDAS stands for: parentheses, exponents, multiplication, division, addition, subtraction



Step 1: evaluate PARENTHESES

PEMDAS order of evaluation: PARENTHESES, exponents, multiplication, division, addition, subtraction

Evaluate the expression within the parentheses




PEMDAS also applies to the expression within the parentheses.

In this case 2 * 5 is evaluated first, and -7 is evaluated second.

PEMDAS applies to the expression inside the parentheses





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Mar 05, 2013
Evaluate
by: Staff


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Part II

Step 2: evaluate EXPONENTS


PEMDAS order of evaluation: parentheses, EXPONENTS, multiplication, division, addition, subtraction

There are no exponents to evaluate.


Step 3: MULTIPLICATION


PEMDAS order of evaluation: parentheses, exponents, MULTIPLICATION, division, addition, subtraction

PEMDAS - multiplication




Step 4: DIVISION


PEMDAS order of evaluation: parentheses, exponents, multiplication, DIVISION, addition, subtraction

There is no division which needs to be evaluated.



Step 5: evaluate ADDITION & SUBTRACTION

PEMDAS order of evaluation: parentheses, exponents, multiplication, division, ADDITION, SUBTRACTION

There is no addition or subtraction which needs to be completed.


The final answer is:

Evaluate numerical expression - final answer








Thanks for writing.

Staff
www.solving-math-problems.com



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