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We can simplify this:
= [2x-5]²
This is a special product:
(a-b)² = a²-2ab+b²
(2x-5)² = (2x)²- 2(2x)(5) + (-5)² = 4x²-20x+25
ohmygod ohmygod thanks! iloveu! hahaha
and what about this? [(x+y)-5]2 ... i really dont understand my math teacher..