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Maths Puzzle
Numerical Ability
How to solve:
(3x-2)(x+5)
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Hello...
I am having some trouble with a proof. I am to use:
(a + bi)(a - bi)
The problem asks:
Show that for a + bi not equal to 0 this product is a positive real number.
Thanks for your help.
the conjugate of
sqare_root(2)-square_root(3) is:
square_root(2)+square_root(3).
But can it be:
-sqare_root(2)-square_root(3)?