Elimination method
x+y=8
x-y=7
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1
Answer:
Since, (x+y)
3
=x
3
+y
3
+3xy(x+y)
∴x
3
+y
3
=(x+y)
3
−3xy(x+y)
Given, x+y=8 and xy=7
⇒x
3
+y
3
=(8)
3
−3(7)(8)
=512−168=344.
Step-by-step explanation:
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