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CBSE Class 7 Answered

Please show me the step by step process to drive the value of x from following equation
 
(4x-5)(2x-5)=105
Asked by SATYEN | 15 May, 2017, 12:11: AM
answered-by-expert Expert Answer
begin mathsize 16px style left parenthesis 4 straight x minus 5 right parenthesis left parenthesis 2 straight x minus 5 right parenthesis equals 105 rightwards double arrow 8 straight x squared minus 20 straight x minus 10 straight x plus 25 equals 105 rightwards double arrow 8 straight x squared minus 30 straight x minus 80 equals 0 rightwards double arrow 4 straight x squared minus 15 straight x minus 40 equals 0 The space roots space of space this space quadratic space equation space are space not space real. end style
Answered by Rashmi Khot | 15 May, 2017, 08:55: AM

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