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If A =  , the eigen values of this matrix are -1 and 7, then the value of ab is (Answer should be integer) ________.
Correct answer is '15'. Can you explain this answer?
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IfA =, the eigen values of this matrix are -1 and 7, then the value of...
Given A = 
We know that trace of A= sum ofeigen values
⇒ a + 1 = -1 + 7
⇒ a = 5
Also det (A) = a - 4b = product of eigen values
⇒ a - 4b = -7 ⇒ -5 - 4b = -7 i.e.,b = 3
⇒ ab = 15
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IfA =, the eigen values of this matrix are -1 and 7, then the value of ab is (Answer should beinteger) ________.Correct answer is '15'. Can you explain this answer?
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