Asked by Sabrina
Multiply (5ã5 - 15ã7)(3ã5 +9ã7)
Answers
Answered by
Sabrina
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.
(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.
Answered by
Reiny
(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
Answered by
Sabrina
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.
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