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40+3x = 4 (x+3)
40+3x = 4x+12
40-12=4x-3x
28 = x
sisi persegi = x+3 = 28+3=31
L= SxS
L=31x31
L= 961cm²
40 + 3x = 4 ( x + 3 )
40 + 3x = 4x + 12
3x -4x = 12 - 40
x = 28
sisi = x + 3
= 28 + 3
= 31cm
L = s²
= 31²
= 961cm²