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Semoga Membantu
= (2x - 5)(2x - 5)
Ingat saja
(a - b)(a - b) = a² -2ab + b²
Cara dapatnya
a . a + (a . -b) + (-b . a) +b²
Maka jadinya
2x . 2x -2x . 5 -2x.5 + 5²
= 4x² -20x + 25