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

Answer 1

Genesis Allen

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#

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Answer 2

Kennedy Adams

To evaluate the expression (8b + 4d) when (b = 9) and (d = 5), you substitute the values of (b) and (d) into the expression and perform the arithmetic:

(8(9) + 4(5) = 72 + 20 = 92)

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.