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    Question

    Simplify the given expression: [(2.3)3

    + (15.9) ³ + (3.7) ³ – 3 × 2.3 × 15.9 x 3.7)] / [(2.3) ² + (15.9) ² + (3.7) ² – 2.3 × 15.9 – 15.9 × 3.7 – 3.7 × 2.3]
    A 20.4 Correct Answer Incorrect Answer
    B 21.9 Correct Answer Incorrect Answer
    C 22.9 Correct Answer Incorrect Answer
    D 18.5 Correct Answer Incorrect Answer

    Solution

    Let a = 2.3, b = 15.9 and c 3.7. Then [a3+b3+c3 -3abc]/[a2+b2+c2-ab-bc-ca]            … (1) As we know that – a3+b3+c3 -3abc = (a+b+c) [ a2+b2+c2-ab-bc-ca] Put the value in Eq (1). = (a+b+c) [ a2+b2+c2-ab-bc-ca] / [ a2+b2+c2-ab-bc-ca] The term [ a2+b2+c2-ab-bc-ca] cancel out and leave – =(a+b+c) =2.3 +15.9 +3.7 =21.9.

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