x (x- 5x +6 )=0
------
x
I'm not understanding how the denominator x is cancelled out and the is x = 6 or -1.
(4^y + 4^y + 4^y + 4^y)(3^y+3^y+3^y) = (12)^y+1
Not sure how you get y+1 as the ecponent
Thanks!
Algebra - Linear Equation and exponent - stuck!
This topic has expert replies
-
- Junior | Next Rank: 30 Posts
- Posts: 29
- Joined: Mon Nov 17, 2014 4:45 am
-
- Master | Next Rank: 500 Posts
- Posts: 447
- Joined: Fri Nov 08, 2013 7:25 am
- Thanked: 25 times
- Followed by:1 members
I'm not sure what your question is.
Nonetheless, to solve the equation x (x- 5x +6 )=0
we can factorise it:
x(x-2)(x-3)= 0
So x = 0, 2 and 3
Nonetheless, to solve the equation x (x- 5x +6 )=0
we can factorise it:
x(x-2)(x-3)= 0
So x = 0, 2 and 3
-
- Master | Next Rank: 500 Posts
- Posts: 447
- Joined: Fri Nov 08, 2013 7:25 am
- Thanked: 25 times
- Followed by:1 members
Ah, I see the left side is divided by x.Mathsbuddy wrote:I'm not sure what your question is.
Nonetheless, to solve the equation x (x- 5x +6 )=0
we can factorise it:
x(x-2)(x-3)= 0
So x = 0, 2 and 3
x/x = 1, so the equation is just (x-2)(x-3)= 0
So x = 2 and 3
-
- Master | Next Rank: 500 Posts
- Posts: 447
- Joined: Fri Nov 08, 2013 7:25 am
- Thanked: 25 times
- Followed by:1 members
For the second part of your question:
Here is an Index Law formula:
x^a x x^b = x^(a+b)
So:
(4^y + 4^y + 4^y + 4^y)= 4^y x 4 = 4^y x 4^1 = 4^(y+1)
and (3^y+3^y+3^y) = 3^y x 3^1 = 3^(y+1)
Multiply these together:
4^(y+1) x 3^(y+1) = 4 x 4 x 4 x 4... [(y+1) times] x 3 x 3 x 3 x 3 ... [(y+1) times] = 12 x 12 x 12 x 12 x 12 ... [(y+1) times]
= 12^(y+1)
I hope this helps
Here is an Index Law formula:
x^a x x^b = x^(a+b)
So:
(4^y + 4^y + 4^y + 4^y)= 4^y x 4 = 4^y x 4^1 = 4^(y+1)
and (3^y+3^y+3^y) = 3^y x 3^1 = 3^(y+1)
Multiply these together:
4^(y+1) x 3^(y+1) = 4 x 4 x 4 x 4... [(y+1) times] x 3 x 3 x 3 x 3 ... [(y+1) times] = 12 x 12 x 12 x 12 x 12 ... [(y+1) times]
= 12^(y+1)
I hope this helps
- GMATinsight
- Legendary Member
- Posts: 1100
- Joined: Sat May 10, 2014 11:34 pm
- Location: New Delhi, India
- Thanked: 205 times
- Followed by:24 members
Please note that Denominator x can be cancelled out here as it's an EQUATION and not an Inequation[email protected] wrote:x (x- 5x +6 )=0
------
x
I'm not understanding how the denominator x is cancelled out and the is x = 6 or -1.
Thanks!
In case of Inequation X can be cancelled without any change only if X is positive otherwise Inequation sign changes while cancelling x if x to be cancelled is Negative
"GMATinsight"Bhoopendra Singh & Sushma Jha
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour
- GMATinsight
- Legendary Member
- Posts: 1100
- Joined: Sat May 10, 2014 11:34 pm
- Location: New Delhi, India
- Thanked: 205 times
- Followed by:24 members
[email protected] wrote:
(4^y + 4^y + 4^y + 4^y)(3^y+3^y+3^y) = (12)^y+1
Not sure how you get y+1 as the ecponent
Thanks!
(4^y + 4^y + 4^y + 4^y)(3^y+3^y+3^y) = (12)^y+1[email protected] wrote:
(4^y + 4^y + 4^y + 4^y)(3^y+3^y+3^y) = (12)^y+1
Not sure how you get y+1 as the ecponent
Thanks!
Take 4^y common from all terms in first bracket and 3^y from all terms in other bracket on left hand side
4^y(1 + 1 + 1 + 1)3^y (1 + 1 + 1)
= 4^y(4)3^y (3)
= 4^(y+1)3^(y+1)
= 12^(y+1)
"GMATinsight"Bhoopendra Singh & Sushma Jha
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour