Help, Multiplying binomial radicals
I've looked through dozens and dozens of questions, and I can't find an example with this format where both numbers in both sides are under the radical sign, and no numbers to the left, please help. (sqrt 3+4)(sqrt 3-7) The answer is 25-3-sqrt3 how do I get there??
Re: Help, Multiplying binomial radicals
What happens when you multiply through using the pattern (c+d)=ac+ad+bc+bd)
?
Re: Help, Multiplying binomial radicals
Hello, drmattthew!
Multiply as usual ("FOIL") . . . and simplify carefully.
\left(\sqrt{3}-7\right) \;=\;\big(\sqrt{3}\big)\big(\sqrt{3}\big) + \big(\sqrt{3}\big)\big(\text{-}7\big) + \big(4\big)\big(\sqrt{3}\big) + \big(4\big)\big(\text{-}7\big) )
n . . . . . . . . . . . . . 
n . . . . . . . . . . . . . 
