What is the answer to 4(2r+5)=10r

Expand: Use the Distributive Property to multiply 4 by 2r+5:

Subtract 20 from both sides:

Subtract 10r from both sides:

Divide both sides by -2:

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since we know that the two functions are equal, f (x) = g

(x), therefore when we equate the two equations the result should be similar to

3x = x – 4:

a. f(x) = 3x, g(x) = x – 4

equating the two functions:

3x = x – 4             (correct)

so we now got our answer (a)