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The first term of a GP …

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The first term of a GP is 1.If the sum of 3rd and 5th term is 90.Find the common ratio of GP

    • Posted by Yashvi Singh Raghuvanshi 5 years, 8 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Vinkal Kamboj 5 years, 8 months ago

    Given a=1 , ar²+ar⁴=90 ar²(1+r²)=90 1r²(1+r²)=90 Let r²= y y(1+y)=90 y²+y-90=0 y²+10y-9y-90=0 y(y+10)-9(y+10)=0 (y-9)(y+10)=0 Changing y by r² (r²-9)(r²+10)=0 (r²+10) is an imaginary number so neglect it r²=9 r=3

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