Request a call back

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

CBSE Class 9 Answered

if x=1/2+sqroot3, evaluate 2x3-7x2-2x+1
Asked by nisha_vini29 | 23 Apr, 2015, 11:01: PM
answered-by-expert Expert Answer
x equals fraction numerator 1 over denominator 2 plus square root of 3 end fraction rightwards double arrow x equals fraction numerator 1 left parenthesis 2 minus square root of 3 right parenthesis over denominator left parenthesis 2 plus square root of 3 right parenthesis left parenthesis 2 minus square root of 3 right parenthesis end fraction rightwards double arrow x equals fraction numerator left parenthesis 2 minus square root of 3 right parenthesis over denominator 4 minus 3 end fraction therefore x equals 2 minus square root of 3 x minus 2 equals negative square root of 3 x squared minus 4 x plus 4 equals 3 x squared minus 4 x plus 1 equals 0........ left parenthesis i right parenthesis therefore 2 x cubed minus 7 x squared minus 2 x plus 1 equals 2 x cubed minus 8 x squared plus x squared minus 4 x plus 2 x plus 1 equals 2 x cubed minus 8 x squared plus 2 x plus left parenthesis x squared minus 4 x plus 1 right parenthesis equals 2 x cubed minus 8 x squared plus 2 x plus 0 left square bracket F r o m space left parenthesis i right parenthesis right square bracket equals 2 x open parentheses x squared minus 4 x plus 1 close parentheses equals 2 x cross times 0 equals 0 therefore 2 x cubed minus 7 x squared minus 2 x plus 1 equals 0
Answered by Prasenjit Paul | 24 Apr, 2015, 10:23: AM
CBSE 9 - Maths
Asked by omt7989 | 02 Jan, 2024, 07:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by lalitayadav7891 | 06 Dec, 2023, 07:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by mshibilshibil646 | 18 Jun, 2023, 09:37: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by rs9798651 | 17 Apr, 2023, 07:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by sanjaykumarray1982 | 27 Mar, 2023, 11:31: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by yuvikarajpal35 | 16 Mar, 2023, 01:47: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by vaibhavsobaji99 | 08 Feb, 2023, 09:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by babitaji761 | 29 Dec, 2022, 07:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by zbano7424 | 07 Jul, 2022, 08:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
1*1
Asked by muradesrushti66 | 06 Jul, 2022, 08:50: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×