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Given that f(x)=6x+5 find the value of f(a)+f(2a)
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f(x) = 6x+5
The notation f(a) is short for f(x=a). Similarly, f(2a) is f(x=2a). So just replace the x in the function with a or 2a:
f(x) = 6x + 5
f(a) = 6a + 5
f(2a) = 6(2a) + 5 = 12a + 5
f(a) + f(2a) = 6a + 5 + 12a + 5
Combine like terms to get the answer.