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March 6, 2015

March 6, 2015

Posted by **Anonymous** on Wednesday, June 12, 2013 at 5:40pm.

I am unsure how to make a radical sign with the keyboard so I am using a question mark in its place.

(2?5-?28)(?28+4?5)

(?3+2?5)^2

(3?7-6?2)(7?7+?2)

(4x?y+2)(4x?y-?2)

(6?2-5?5)(3?2+2?5)

Thank you for helping.

- algebra -
**MathMate**, Wednesday, June 12, 2013 at 5:59pmFor √, type in

& r a d i c ;

but without the intervening spaces.

I will solve the first one:

Use the FOIL rule

(2√5-√28)(√28+4√5)

=(2√5-2√7)(2√7+4√5)

=4(√5-√7)(√7+2√5)

=4(10-7-√5√7)

=12-4√5√7

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