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

##### 1 Answer

Nov 23, 2016

Plug in each value to its corresponding variable.

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

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

Now simplify.

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

Add.

# color(green)92#