F (2x+3)=5x-3 Nilai F (-2) adalah

f(2x + 3) = 5x - 3
misal 2x + 3 = a maka x = (a - 3) / 2
[tex]f(a) = 5( \frac{a - 3}{2} )- 3 \\ f(a) = \frac{5a \: - 15 }{2} - 3 \\ f(a) = \frac{5a - 15 - 6}{2 } \\ f(a) = \frac{5a - 21}{2} \\ f(x) = \frac{5x - 21}{2} \\ f (- 2) = \frac{5( - 2) - 21}{2} \\ f( - 2) = - \frac{31}{2} [/tex]
atau
f(-2) = - 15 ½