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50 = 2 (2x + 7 + 3x - 2)
50 = 2 (5x + 5)
50 = 10x + 10...pindah ruas.
50 - 10 = 10x
40 = 10x
x = 4
panjang = 2x + 7, maka 2 x 4 + 7 = 15
lebar = 3x - 2, maka 3 x 4 - 2 = 10.
Luas = p x l, 15 x 10 = 150 cm persegi.
p = 2x+7
l = 3x-2
K = 50
mk :
K = 2 (p+l)
50 = 2 (2x+7+3x-2)
50 = 2 x (5x+5)
50 = 10x+10
10x = 50-10
x = 40/10
x = 4
jd = p = 2(4) + 7 = 15 cm
lebr = 3(4) - 2 = 10 cm
jd L = P x l
L = 15 x 10
L = 150 cm²