Ask a Doubt
Request a call back

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

ICSE Class 9 Answered

How to solve  Ex 3.1  Q 15. If a + 1 / a = 3 ,find (1) a2  + 1/a2  (2) a4 + 1/a4 
Asked by prathameshbhantar09.9spicertl | 13 Jul, 2020, 06:21: PM
answered-by-expert Expert Answer
Given: a + 1/a = 3
 
left parenthesis 1 right parenthesis straight a squared plus 1 over straight a squared equals open parentheses straight a plus 1 over straight a close parentheses squared minus 2 equals open parentheses 3 close parentheses squared minus 2 equals 9 minus 2 equals 7 left parenthesis 2 right parenthesis straight a to the power of 4 plus 1 over straight a to the power of 4 equals open parentheses straight a squared plus 1 over straight a squared close parentheses squared minus 2 equals open parentheses 7 close parentheses squared minus 2 equals 49 minus 2 equals 47
Answered by Renu Varma | 14 Jul, 2020, 11:38: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
ICSE 9 - Maths
(2X+3y+5)(2x+3y-5)
question image
Asked by shantanupandey271208 | 21 Apr, 2024, 03:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
if X+1÷x =6 find x-1/x ,x²-1/x²
Asked by ysubha24 | 06 Apr, 2024, 06:24: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
if a^2+b^2+c^2=20 and a+b+c=0 find ab+bc+ca  
Asked by ck902183 | 10 Mar, 2024, 11:51: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
Q16. 4a² - 12a + 9 - 49b²
Asked by Swatisasturkar | 04 Feb, 2023, 01:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
if X+y–z=4 and x²+y²+z²=30, then find value of xy–yz–zx.
Asked by pratimachouhan674 | 29 Jun, 2022, 11:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
how can we solve 8 sum
question image
Asked by deeya0121 | 01 Jun, 2022, 10:28: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
a+b=10 and a-b=2 find a^2 + b^2
Asked by pushti.pancholi | 24 Apr, 2022, 02:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
If x–1/x =3/2 ,then find x²–1/x²
Asked by sangeetadubey53835 | 06 Jul, 2021, 06:47: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
9(b+2a)2-4a2
Asked by vrundasorathiya83 | 01 Jul, 2021, 10:22: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
Use identities to evaluate (i)(101)²
Asked by navkirankaurrehal23 | 27 Apr, 2021, 11:19: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×