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OpenStudy (anonymous):
Choose the correct product of (5x − 3)(5x + 3). Is it 25x^2-9 ?
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OpenStudy (asnaseer):
yes
OpenStudy (anonymous):
Yep! Glad to see you're getting this down now :-D
OpenStudy (anonymous):
The middle two terms cancel out as you may have noticed (+15x - 15x = 0)
OpenStudy (asnaseer):
it is a specific instance of this factorisation:\[a^2-b^2=(a+b)(a-b)\]
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