Materi tentang fungsi

f(x) = 2(2x+15)
f(a) = 2(2.a+15) = 3a-2
          4a + 30 = 3a-2
           a = -32

f( x ) = 2 ( 2x + 15 )
f( a ) = 2 (2(a) + 15 ) = 3a - 2
f( a ) = 4a + 30 = 3a - 2
f( a ) = 4a - 3a = - 2 - 30
f( a ) = a = - 32 ✔️
Opsi B. - 32 ✔️

Semoga bermanfaat......
-Prisco