Question

Sebuah fungsi dengan rumus f(x) = -7x + 5
tentukan nilai dari f(-3) dan f(2)
jila f(a) = 9 tentukanlah nilai a

Answer 1

F(-3)
= -7(-3) + 5
= 21 + 5
= 26

f(2)
= -7(2) + 5
= -14 + 5
= -9

f(a)
9 = -7(a) + 5
9 = -7a + 5
9 -5 = -7a
4 = -7a
a = -4/7 

Answer 2

F(x) = -7x + 5

f(-3) 
= -7(-3) + 5
= 21 + 5
= 26

f(2)
= -7(2) + 5
= -14 + 5
= -9

f(a) = 9
9 = -7(a) + 5
9 = -7a + 5
9-5 = -7a
4 = -7a
a = -4/7