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If (a + b)2 − 2(a + b) = 80 and ab = 16, then what can be the value of 3a − 19b?
  • a)
    −16
  • b)
    −14
  • c)
    −18
  • d)
    −20
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
If (a + b)2− 2(a + b) = 80 and ab = 16, then what can be the val...
Assume a + b = x
x2 – 2x – 80 = 0
x = 10
ab = 16
a = 8, b = 2
3 × a – 19b = −14
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If (a + b)2− 2(a + b) = 80 and ab = 16, then what can be the value of 3a − 19b?a)−16b)−14c)−18d)−20Correct answer is option 'B'. Can you explain this answer?
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