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K = 2 ( p + l )
K = 2 ( 3x - 4 + x + 1 )
K = 2 ( 4x - 3 )
K = 8x - 6
b).
34 = 8x - 6
8x = 34 + 6
8x = 40
x = 5
L = ( 3x - 4 ) cm × ( x + 1 ) cm
L = ( 15 - 4 ) cm × ( 5 + 1 ) cm
L = 11 cm × 6 cm
L = 66 cm²
panjang = (3x - 4)
lebar = ( x+1)
a. Keliling = 2 x ( p + l)
= 2 x [(3x - 4)+( x+1)]
= 2 x (4x - 3)
= 8x - 6
b K = 34
34 = 8x - 6
8x = 34 + 6
8x = 40
x = 5
maka
panjang = (3x - 4) = 3 (5) - 4 = 11
lebar = ( x+1) = 5 + 1= 6
jadi Luas = p x l = 11 x 6 = 66 cm²