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OpenStudy (anonymous):
Multiply (2 + square root of 7) (4 - square root of 7)
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OpenStudy (karatechopper):
FOIL!
OpenStudy (anonymous):
Make this easy. Let x = sqrt(7) and multiply (2+x)(4-x) and you get what? You get three terms and when you evaluate it, the one with x squared becomes an integer and you end up with just two terms. As noted above without any method.
OpenStudy (anonymous):
OpenStudy (kropot72):
Answer is 1 + 2* square root of seven. Do you want to go thu it?
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