Question

Evaluate the following expressions if a = 2, b = 3, x = 4, and y = 5.
b^2+3(2x-y)

Answer 1

Hi there! Hopefully this helps!

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Answer: 18

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First we need to substitute the value of the variable into the expression.

$b^{2}+3(2x-y)$ = $3^{2} + 3 (2(4)-5)$ .

Now we need to solve $3^{2} + 3 (2(4)-5)$.

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$3^{2} + 3 (2(4)-5)$

First, calculate 3 to the power of 2 and get 9.

$9+3(2\times 4-5)=18$

Multiply 2 and 4 to get 8.

$9+3(8-5) =18$  

Subtract 5 from 8 to get 3.    

$9+3\times 3 =18$  

Multiply 3 and 3 to get 9.

$9+9 =18$.

And the answer is, you guessed it, 18!