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(x+3) 2
40x2 = (x+3) 5
80 = 5x + 15
5x= 80-15
x = 65
5
x = 13
b. (2x+4) = 4
72 9
(2x+4) x 9 = 72 x4
18x + 36 = 288
18x = 288 - 36
x = 252
18
x = 14
c. 8 = (y+5)
5 15
8 x 15 = (y+5) x 5
120 = 5y+25
5y = 120 - 25
y = 95
5
y = 19
d. 7 = 28
4 (3y-2)
7(3y-2) = 28x4
21y-14 = 112
21y = 112+14
y = 126
21
y = 6
semua memakai cara perkalian silang..