Question 75764: If x = -2, y = 3, and z = 5, evaluate the following.
(3z + y)(z + y)
Answer by bucky(2189)   (Show Source):
You can put this solution on YOUR website! Given the expression: (3z + y)(z + y) and the values x = -2, y = 3, and z = 5
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evaluate the expression for the given values of the variables.
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This is a substitution or replacement problem. Just substitute the given values of x,
y, and z into the given expression. When you substitute -2 for x, 3 for y, and 5 for z,
the expression is transformed to:
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((3*5) + 3)*(5 + 3)
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Note that there is no substitution for x because x does not appear in the expression.
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Do the multiplication in the first part of the expression. The 3*5 is equal to 15 so the
expression becomes:
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(15 + 3)*(5 + 3)
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Next do the additions inside each set of parentheses to get:
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(18)*(8)
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And now the multiplication is just 18 times 8 to give the answer of 144. That's it.
With the given substitutions the expression is evaluated and its value is 144.
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Hope this helps you to understand the basics of what you do to evaluate an expression
if you are given values for each of the variables in the expression.
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