pake cara yaaaa kaa pliss

Luas tnh = (10 - x)² = 100 - 20x + x²
Luas kolam = (8 - x)² = 64 - 16x + x²
Tnh - kolam = 28
100 - 20x + x² - 64 + 16x - x² = 28
36 - 4x = 28
4x = 36 - 28 = 8
x = 2

Luas tanah = 10 - 2 = 8 x 8 = 64