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keliling = 2(3x+2+2x+-3)
keliling = 2(5x + 2+-3)
keliling = 2(5x -1)
keliling = 10x - 2
b) 36 = 10x - 2
36+2 = 10x -2+2
38 = 10x
x = 38/10 = 3,8
panjang = 3x+2 = (3.3,8) + 2 = 11,4 + 2 = 13,4 cm
lebar = 2x - 3 = (2.3,8) - 3 = 7,6 - 3 = 4,6 cm
2( 3x + 2 ) + 2( 2x - 3 ) =
6x + 4 + 4x - 6 =10 x - 2
B.
10x - 2 = 36
10x = 36 + 2 = 38
x = 3,8
Panjang
3x + 2
3( 3,8 ) + 2 = 11,4 + 2 = 13,4 cm
Lebar
2x - 3
2 ( 3,8 ) - 3 = 7,6 - 3 = 4,6 cm
Pembuktian
2 ( 13,4 + 4,6 )
2 . 18
36