x3-y3 when x-y =5 and xy=66
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Given x - y = 5.
On cubing both sides, we get
(x - y)^3 = (5)^3
x^3 - y^3 - 3xy(x - y) = 125
x^3 - y^3 - 3xy(5) = 125
x^3 - y^3 - 3(66)(5) = 125
x^3 - y^3 - 990 = 125
x^3 - y^3 = 1115.
Hope this helps!
On cubing both sides, we get
(x - y)^3 = (5)^3
x^3 - y^3 - 3xy(x - y) = 125
x^3 - y^3 - 3xy(5) = 125
x^3 - y^3 - 3(66)(5) = 125
x^3 - y^3 - 990 = 125
x^3 - y^3 = 1115.
Hope this helps!
Thomson:
can you make it some more simple
This is the simple method bro
can you tell which formula did you use
(a-b)^3 = a^3 - b^3 - 3ab(a-b)
Thank You So Much.It helped a lot i am preparing for My Exams
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2
Hi,
Please see the attached file!
Thanks
Please see the attached file!
Thanks
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