Ask a Doubt
Request a call back

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

ICSE Class 9 Answered

<div>2^2x &nbsp;+ 2^(x+2) &nbsp;- 4 * 2^3=0</div>
Asked by malvika7m | 15 May, 2016, 02:38: PM
Expert Answer
C o n s i d e r space t h e space g i v e n space e q u a t i o n 2 to the power of 2 x end exponent plus 2 to the power of open parentheses x plus 2 close parentheses end exponent minus 4 cross times 2 cubed equals 0 U sin g space l a w s space o f space e x p o n e n t s comma space r e w r i t i n g space t h e space a b o v e space e q u a t i o n comma space w e space h a v e comma open parentheses 2 squared close parentheses to the power of x plus 2 to the power of x cross times 2 squared minus 4 cross times 8 equals 0 rightwards double arrow open parentheses 2 to the power of x close parentheses squared plus 2 to the power of x cross times 4 minus 32 equals 0 S u b s t i t u t i n g space t h e space v a l u e space y equals 2 to the power of x comma space t h e space a b o v e space e q u a t i o n space b e c o m e s comma rightwards double arrow y squared plus 4 y minus 32 equals 0 T h i s space i s space a space q u a d r a t i c space i n space y. S o l v i n g space t h e space q u a d r a t i c space w e space h a v e comma y squared plus 8 y minus 4 y minus 32 equals 0 rightwards double arrow y open parentheses y plus 8 close parentheses minus 4 open parentheses y plus 8 close parentheses equals 0 rightwards double arrow open parentheses y minus 4 close parentheses open parentheses y plus 8 close parentheses equals 0 rightwards double arrow y minus 4 equals 0 space o r space y plus 8 equals 0 rightwards double arrow y equals 4 space o r space y equals negative 8 y equals 4 space rightwards double arrow 2 to the power of x equals 4 rightwards double arrow 2 to the power of x equals 2 squared rightwards double arrow x equals 2 N e g l e c t i n g space t h e space n e g a t i v e space r o o t space y equals negative 8 comma space w e space h a v e comma space x equals 2
Answered by Vimala | 16 May, 2016, 11:17: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
ICSE 9 - Maths
Question 2
Asked by reena.biswal123 | 28 Nov, 2021, 06:36: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
(4√27)-3/4. solve this
Asked by abhishekverma0300 | 12 Jun, 2021, 09:29: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
If 25 power x+1 =125/5x then find the value of x
Asked by ashishthor667 | 13 Feb, 2021, 10:35: AM
ANSWERED BY EXPERT
ICSE 9 - Maths
If 3^x+1=9^x-3find the value of 2^1+x  
Asked by atiqurrahman9369 | 04 Oct, 2020, 01:14: AM
ANSWERED BY EXPERT
ICSE 9 - Maths
lm√(x^l/x^m)*mn√(x^m/x^n)*nl√(x^n/x^l)
Asked by debjganguly | 26 Sep, 2020, 06:24: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
I did not understand law of exponent (a×b)raise to m = a raise to m × a raise to n
Asked by aayushyadav11.9spicertl | 27 Jun, 2020, 05:37: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
Evaluate - (3/4)-2 × (9/16)4 × (59/100)0
Asked by mangalgeneral | 01 Jun, 2020, 07:50: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
How to solve this problem (0.027) ^1/3
Asked by eshaanbayale51.9spicertl | 26 May, 2020, 02:20: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
How to solve:(16/81)^-3/4 * (9/49)^-3/2
Asked by anujapandit76.9spicertl | 25 May, 2020, 01:46: PM
ANSWERED BY EXPERT
ICSE 9 - Maths
(0.027)^1/3=?
Asked by avishkargosavi89.9spicertl | 22 May, 2020, 11:07: AM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt