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sayan kumar Grade:
        

solve:-


  (2x-7)(x-3)(x+3)(2x+5)=91

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear sayan


(2x-7)(x-3)(x+3)(2x+5)=91


(2x-6-1)(x-3)(x+3)(2x+6-1)=91


[2(x-3)2 - (x-3)][ 2(x+3)2 - (x+3)]=91


4(x-3)2(x+3)2  -2(x+3)2(x-3)-2(x-3)2(x+3) +(x-3)(x+3) = 91


4(x-3)2(x+3)2  -2(x+3)(x-3)2x +(x2-9) = 91


[x+2(x-3)(x+3)]2  =100


or 2x2 +x-18 =±10


 + sign


  2x2 +x-28 =0


- sign


2x2 +x-8 =0


now solve these two equation and find solution


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Badiuddin


 

7 years ago
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