ANd the radical sign keeps going away when I try to post this. It is supposed to be:
(5 radical sign 5 - 15 radical sign 7)x (3 radical sign 5 + 9 radical sign 7)
Am I supposed to use th edistributive law? I am so confused.
Multiply (5�ã5 - 15�ã7)(3�ã5 +9�ã7)
3 answers
(5√5 - 15√7)(3√5 + 9√7)
= 15(5) + 45√35 - 45√35 - 135(7)
= -870
or
5(√5-3√7)(3)(√5 + 3√7) , do you see the difference of square pattern?
= 15(5 - 63)
= -870
= 15(5) + 45√35 - 45√35 - 135(7)
= -870
or
5(√5-3√7)(3)(√5 + 3√7) , do you see the difference of square pattern?
= 15(5 - 63)
= -870
yes I do now. I don't know why I am having such a hard time. Thank you so much! Now I can do my other problems.