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If A2 + B2 = 15 and AB = 10, what is the value of the expression (A – B)2  + (A + B)2 ?
  • a)
    10
  • b)
    20
  • c)
    30
  • d)
    60
  • e)
    70
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If A2 + B2 = 15 and AB = 10, what is the value of the expression(A &nd...
The best answer is C.
(A – B)2  + (A + B)2 = A2 – 2AB + B2 + A2 + 2AB + B2 = 2(A2 + B2) =  30.
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If A2 + B2 = 15 and AB = 10, what is the value of the expression(A &nd...
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If A2 + B2 = 15 and AB = 10, what is the value of the expression(A – B)2 + (A + B)2 ?a)10b)20c)30d)60e)70Correct answer is option 'C'. Can you explain this answer?
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