if ( a + b ) = 5, a² + b² = 6, find ab.
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a + b = 5
squaring both sides,
a² + 2ab + b² = 25
a² + b² + 2ab = 25
Putting a² + b² = 6,
6 + 2ab = 25
2ab = 25 - 6
2ab = 19
∴ab = 19/2
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