vicada2782
14.12.2019 •
Mathematics
Let f(x) = 4x − 3. if f(a) = 9 and f(b) = 5, then what is f(a + b) ?
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Ответ:
f(a) = 4a-3
9 = 4a-3
4a = 12
a = 12 / 4
a = 3
f(b) = 4b-3
5+3 = 4b
8 = 4b
b = 8 / 4
b = 2
f(a+b) = 4(a+b) - 3
f(a+b) = 4(3+2) - 3
f(a+b) = 4(5) - 3
f(a+b) = 20 - 3
f(a+b) = 17
Ответ: