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OpenStudy (anonymous):
The sum of two numbers is 5 and their difference is 2. Which of the following could be the difference of their squares
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hartnn (hartnn):
x+y = 5 x-y=2 just multiply them, what u get ?
hartnn (hartnn):
do you know why we are 'multiplying' here ?
OpenStudy (anonymous):
Because of the squares?
hartnn (hartnn):
difference of squares = \(x^2-y^2=(x+y)(x-y)\) thats why :)
OpenStudy (anonymous):
So multiply 5 and 2?
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hartnn (hartnn):
yup.
hartnn (hartnn):
don't tell me 10 isn't in choices... :P
OpenStudy (anonymous):
No, you're right! :D
hartnn (hartnn):
your welcome ^_^
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