How do you evaluate the expression $8 b + 4 d$ $8b+4d$ if b=9, d=5?

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Answer 1 · 2016-11-23T22:20:43

Plug in each value to its corresponding variable.

$8 b + 4 d$ $8color(blue)b + 4color(red)d$ ; $b = 9, d = 5$ $b = color(blue)9, d = color(red)5$

$8 (9) + 4 (5)$ $8(color(blue)9) + 4(color(red)5)$

Now simplify.

$72 + 20$ $color(blue)72 + color(red) 20$

Add.

$92$ $color(green)92$

How do you evaluate the expression 8b+4d8b+4d8b+4d if b=9, d=5?