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OpenStudy (anonymous):
simplify the expression. (6 - square root of 11)(6 + square root of 11) A. 47 + 12(square root of 11) B. -85 C. 25
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OpenStudy (saifoo.khan):
Use FOIL
OpenStudy (kropot72):
Just multiply the bracketted expressions together:\[(6-\sqrt{11})(6+\sqrt{11)}=36-11\]
OpenStudy (kropot72):
The answer is of course 36 - 11 = 25 (Choice C).
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