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f(2) = 2a + b = 9
------------------ +
2b = -2
b = -1
2a+ (-1) = 9
2a = 10
a = 5
f(x) = 5x - 1
f(7) = 5.7 - 1
= 34
19. f(-3) = 3+(-3)² = 12, f(3) = 3+3² = 12
f(-2) = 3+(-2)² = 7, f(2) = 3+2² = 7
f(-1) = 3+(-1)² = 4 f(1) = 3+1² = 4
f(0) = 3+0² = 3
Daerah hasil {3,4,7,12}
20. n(TM U BT) = n(S) - n(TN U BT)c
= 50 - 15
= 35
n(TM U BT) = n(TM)+n(BT) - n(TM Π BT)
35 = 32+23 - n (TM Π BT)
n (TM Π BT) = 55-35
= 20
n(TM) = 32-20
= 12
21. <CBD = 180-45
= 135
<ACD = 180 - (135+22)
= 180-157
= 23
22. GSL = √ AB² - (R-r)²
= √ 41² - (15-6)²
= √1600
= 40
23. d = √39²+80²
= √1521+6400
= √7921
= 89
24. bahan = Luas
L layang2 = 1/2. d1. d2
= 1/2. 30.50
= 750
Luas bahan = 5 x 750
= 3750 cm²
25. Garis sumbu
26. sisi miring = √10² + (55-31)²
= √100+ 576
= √676
= 26
keliling = (20- 2.4) + (31+4+26+26+4+31)
= 12 + 122
= 134 cm
27. perbandingan 4 dan 8 diperkecil = (1) : (2)
sehingga x = 15.(1) + 24.(2) / (1)+(2)
= 15+48 / 3
= 63 / 3
= 21
Silahkan di pelajari.