autumna28
autumna28
11-11-2019
Mathematics
contestada
Given f(x) = 2x + 9, if f(x) = 15, find x.
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flcral9230
flcral9230
11-11-2019
if f(x) = 15, then rewrite the equation replacing the f(x) with 15
15 = 2x + 9
subtract 9 from sides
15 - 9 = 6
9 - 9 = 0
then, you would be left with 6 = 2x
divide by 2 on both sides
6/2 = 3
2x/2 = x
x would be 3 :)
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