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=2 ( 3x-2 + x +5 )
= 2 ( 2x + 3 )
= 4x +6
b=4x + 6 = 42
x=32/3
x=8
panjang = 3(8)-2 = 22 cm
lebar = 8 +5 = 13 cm.
semoga membantu kawan. terbaiknya yah...
dit: k? k=62? p? l?
jwb: k= 2(p+l)
62=2(3x-2 + x+5)
62= 2(4x+3)
62 = 8x+6
62 - 6 = 8x
56=8x
x = 56/8 = 7
p = 3x-2 = 3.7-2= 21-2= 19
l = x+5 = 7+5 = 12
a) keliling dinyatakan dengan x
maka x = 2 (p+l) = 2 (19+12) = 2x31= 62
b) k= 2(p+l)
62=2(3x-2 + x+5)
62= 2(4x+3)
62 = 8x+6
62 - 6 = 8x
56=8x
x = 56/8 = 7
c) p = 3x-2 = 3.7-2= 21-2= 19
l = x+5 = 7+5 = 12
semoga bermanfaat :)