if a-b=5 a^2+b^2=49 find ab
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a - b = 5
a² + b² = 49
( a - b )² = a² + b² - 2ab
( 5 )² = 49 - 2ab
25 - 49 = - 2ab
- 24 / - 2 = ab
12 = ab
Hope it helps
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