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2x² + 48x = 864 disederhanakan menjadi x² + 24x = 432
x² + 24x + (24/2)²= 432 + 576/4
( x + 12)² = 576
x + 12 = √576
x = 24 -12
x = 12
jadi, panjang sisi alasnya = 12 cm