If a + b = 9, ab = 4, find the value of a ^ 2+ b^ 2
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Answer:
a + b = 9 ________ (1)
Squaring both sides
(a+b)
2
=87
a
2
+2ab+b
2
=87
ab = 4 ______ (2)
a
2
+8+b
2
=87
a
2
+b
2
=73
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