Join NOW to get access to exclusive study material for best results

Advertisement

ICSE Class 10 Answered


For what value of k , (4-k)x2 +(2k+4)x +(8k+1) = 0 is a perfect square

 

Asked by agupte28 | 27 Jul, 2019, 05:56: PM
Expert Answer
left parenthesis 4 minus straight k right parenthesis straight x squared space plus left parenthesis 2 straight k plus 4 right parenthesis straight x space plus left parenthesis 8 straight k plus 1 right parenthesis space equals space 0
for space perfect space square
straight b squared minus 4 ac equals 0
left parenthesis 2 straight k plus 4 right parenthesis squared minus 4 left parenthesis 4 minus straight k right parenthesis left parenthesis 8 straight k plus 1 right parenthesis space equals 0
4 straight k squared plus 16 straight k plus 16 minus 4 open parentheses 32 straight k plus 4 minus 8 straight k squared minus straight k close parentheses equals 0
4 straight k squared plus 16 straight k plus 16 minus 4 open parentheses 31 straight k plus 4 minus 8 straight k squared close parentheses equals 0
4 straight k squared plus 16 straight k plus 16 minus 124 straight k minus 16 plus 32 straight k squared equals 0
36 straight k squared plus 16 straight k minus 124 straight k equals 0
36 straight k squared minus 108 straight k equals 0
36 straight k open parentheses straight k minus 3 close parentheses equals 0
straight k equals 0 comma 3
Answered by Arun | 28 Jul, 2019, 11:53: AM
ICSE 10 - Maths
Asked by mohitmore008 | 30 Jun, 2022, 08:16: PM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by siddghode4371 | 28 Sep, 2021, 10:04: AM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by amit.clw4 | 22 May, 2021, 07:08: PM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by triptiagarwal910 | 09 Jun, 2020, 11:41: AM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by saitipparthi79.10spicertl | 14 May, 2020, 09:20: AM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by thakurjyoti016 | 30 Mar, 2020, 12:10: AM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by agupte28 | 27 Jul, 2019, 05:56: PM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by Ashutosh | 21 Feb, 2018, 07:51: PM
ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by Ananya | 18 Feb, 2018, 08:14: PM
ANSWERED BY EXPERT

Starting early can help you score better! Avail 25% off on study pack