if a²+b²=20 ab=2 find the value of
Answers
Answered by
1
Answer:
Answer:
+-3
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Step-by-step explanation:
(a-b) ^2= a2 + b2 - 2ab
= 49-2×20
= 49-40
=9
Therefore, a-b= square root +-9
=+-3
Answered by
0
Answer:
Given a+b =10
so (a+b)
2
=a
2
+b
2
+2ab
10
2
=58+2ab
∴2ab=100−58=42
∴ab=21
(a+b)
3
=a
3
+b
3
+3ab(a+b)
10
3
=a
3
+b
3
+3×21×10
∴a
3
+b
3
=1000−630=370
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