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s.s = p.l
x.x= (x+20)(x-10)
x=(x^2+10x-200)/x
x=x+10-(200/x)
x-x+ (200/x) = 10
200/x=10
x= 20
Luas persegi = 20.20=400 m^2
Luas p.panjang= 10.40=400 m^2
Luas kebun = 400 + 400= 800 m^2
Ket: ^2 ( maksudnya pangkat2)