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OpenStudy (anonymous):
21. What is the factored form of the expression? 10x^2 – 43xy – 66y^2 (1 point) A (2x + 11y)(5x – 6y) B (2x + 11y)(5x + 6y) C (2x – 11y)(5x – 6y) D (2x – 11y)(5x + 6y)
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OpenStudy (danjs):
since they gave you choices, can you expand them out, that would be easiest i think
OpenStudy (danjs):
the foil thing
OpenStudy (danjs):
you want a -66y^2 at the end, so A and D are possible choices, +11*-6 and -11*+6 give the -66 you need, the other 2 give +66
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