if a-b=3 and a3 -b3=117 ,then what is the value of |a+b|=
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Answer:
a + b = 7
Step-by-step explanation:
( a - b )³ = a³ - b³ - 3ab × (a-b)
3³ = 117 - 3ab × (3)
27 = 117 - 9ab
9ab = 117 - 27
9ab = 90
ab = 10
( a + b )² = (a - b)² + 4ab
( a + b )² = 3² + 4*10
( a + b )² = 9 + 40
( a + b )² = 49
a + b = 7
golu795:
thnku
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