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[tex](15a-4n-6) ^{2} [/tex]

Sagot :

Mlcparra16viz
Note that:
(a-b-c)² = a²+b²+c²-2ab-2ac+2bc

(15a-4n-6)²
= (15a)² + (4n)² + 6² - 2(15a)(4n) - 2(15a)(6) + 2(4n)(6)
= 225a² + 16n² + 36 - 120an - 180a + 48n