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CBSE Class 9 Answered

factorise :-8(x^2-5x)-84
Asked by itishreepanda999 | 31 May, 2018, 09:02: PM
answered-by-expert Expert Answer
begin mathsize 16px style 8 straight x squared minus 40 straight x minus 84 equals 0
using space formula space method
straight x equals fraction numerator 40 plus-or-minus square root of 40 squared plus 4 cross times 8 cross times 84 end root over denominator 2 cross times 8 end fraction
straight x equals fraction numerator 40 plus-or-minus 8 square root of 67 over denominator 16 end fraction
straight x equals fraction numerator 5 plus-or-minus square root of 67 over denominator 2 end fraction
factors space are space open parentheses straight x minus fraction numerator 5 plus square root of 67 over denominator 2 end fraction close parentheses open parentheses straight x minus fraction numerator 5 minus square root of 67 over denominator 2 end fraction close parentheses end style
Answered by Arun | 01 Jun, 2018, 06:14: PM
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