Question

Kak tolong dibantu ya nomer 98-100​

Answer 1

98. f(x) = 4x-1 ; f(a) = -9 ; f(2) = b




a - b = -2 -7 = -9 (a)

99. f(x) = ax + b ; f(2) = 1 ; f(-1) = -5

f(2) = 2a + b = 1 ..... (1)
f(-1) = -a + b = -5 ..... (2)

2a + b = 1
-a + b = -5
—————— -
3a = 6
a = 2

-2 + b = -5
b = -5 + 2
b = -3

a - b = 2 - (-3)
a - b = 5 (A)

100. f(x) = px + q ; f(3) = -4 ; f(-2) = 16

f(3) = 3p + q = -4 ..... (1)
f(-2) = -2p + q = 16 ... (2)

3p + q = -4
-2p + q = 16
———————— -
5p = -20
p = -4

3p + q = -4
3(-4) + q = -4
-12 + q = -4
q = -4 + 12
q = 8

f(x) = -4x + 8
f(-4) = -4 (-4) + 8
f(-4) = 16 + 8
f(-4) = 24

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