18. If (a – b) = 7 and ab = 9, then (a? + b2) = ?​

Question

18. If (a – b) = 7 and ab = 9, then (a? + b2) = ?​

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Madeline 2 months 2021-11-28T10:30:23+00:00 2 Answers 0 views 0

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    0
    2021-11-28T10:31:29+00:00

    I think you made a typo… So, the correct ques will be

     {( {a }^{2}  + b)}^{2}

    Refer to the attachment for the answer….

    0
    2021-11-28T10:32:06+00:00

    a - b = 7

    ab = 9

    Squaring both side, we get,

    (a - b)^{2}  = 49

    Or,

     {a}^{2}  - 2ab +  {b}^{2}  = 49

    Putting the value of ab, we get,

     {a}^{2}  + b^{2}  - 2 \times 9 = 49

    Or,

     {a}^{2}  + b^{2}  = 49 + 18

    Or,

     {a}^{2}  +  {b}^{2}  = 67

    Therefore, the answer is 67.

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