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= (3x + 5) + (4x) + (2x + 7) + (4x)
= 3x + 5 + 4x + 2x + 7 + 4x
= 3x + 4x + 2x + 4x + 5 + 7
= 13x + 12
L = s × s
= (2x + 7) × (3x - 2)
= 6x² - 4x + 21x - 14
= 6x² + 17x - 14
3x+5=2x+7
x=2
keliling = 2(3x+5) + 2.4x = 14x+ 10 = 28+10 = 38
12
2x+7 = 3x-2
x = 9
luas = (2x+ 7 )^2 = 25^2 = 625