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56=2x(3x+5)+(2x-2)
28=5x+3
25=5x
5=x
L=pxl
=(3x+5)x(2x-2)
=15+5x10-2
=20x8
=160
p = 3x+5
l = 2x-2
K = 56 cm
maka :
K = 2 x (p+l)
56 = 2 x (3x+5 + 2x-2)
56 = 2 x (5x+3)
56 = 10x + 6
10x = 56-6
x = 50/10
x = 5 cm
ukuran persegi panjang menjadi :
panjang = 3x + 5 = 3(5) + 5 = 20 cm
lebar = 2x-2 = 2(5) - 2 = 8 cm
Luas = p xl
= 20 x 8
= 160 cm²