it can be
-5
or
5
or
10
or
none of these
thank you!!
2007-12-17 16:02:09 · 11 answers · asked by Jen C 1 in Science & Mathematics ➔ Mathematics
(3x+5)(2x-3)=(x-1)(6x+5)
6x² + x -15 = 6x² - x - 5
2x = 10
x = 5
Checking...
(15 + 5 ) ( 10 - 3 ) = ( 5 - 1 ) ( 30 + 5 )
( 20 ) ( 7 ) = ( 4 ) ( 35 )
140 = 140
2007-12-17 16:10:12 · answer #1 · answered by jgoulden 7 · 0⤊ 1⤋
(3x+5)(2x-3)=(x-1)(6x+5)
6x^2 + 10x -9x -15 = 6x^2 -6x +5x -5
cancel 6x^2 and solve the equation
x-15= -x -5
x+x= 15-5
2x=10
x=10/2
x=5
2007-12-17 16:14:15 · answer #2 · answered by Roslyn** luv maths 2 · 0⤊ 1⤋
(3x +5)(2x - 3) = (x - 1)(6x +5)
3x(2x - 3) +5(2x -3) = x(6x +5) -(6x + 5)
6x^2 -9x + 10x - 15 = 6x^2 +5x - 6x -5
x - 15 = -x -5
2x = 10
x= 5
CHECK
{3(5) + 5)( 2(5) - 3} = { ((5) - 1)(6(5) +5)}
{ (20 )(7)} = {4(35))
140 = 140
2007-12-17 17:07:45 · answer #3 · answered by OINKPI 1 · 0⤊ 1⤋
(3x + 5)(2x - 3) = (x - 1)(6x + 5)
(3x*2x)+(3x*-3)+(5*2x)+(5*-3)=(x*6x)+(x*5)+(-1*6x)+(-1*5)
6x^2 - 9x + 10x - 15 = 6x^2 + 5x - 6x - 5
6x^2-6x^2-9x+10x -5x+6x = -5 + 15
2x = 10
x = 5
for check
(3(5)+5)(2(5)-3)=((5)-1)(6(5)+5)
(15+5)(10-3)=(5-1)(30+5)
(20)(7) = (4)(35)
140 = 140
therefor x=5 is correct answer
2007-12-17 16:41:34 · answer #4 · answered by Rayan Ghazi Ahmed 4 · 0⤊ 1⤋
6x^2 - 9x + 10x - 15 = 6x^2 + 5x - 6x - 5
6x^2 - 6x^2 - 9x + 10x - 15 - 5x + 6x + 5 = 0
2x - 10 = 0
2x = 10
x = 5
2007-12-17 16:30:47 · answer #5 · answered by magedoll13 2 · 0⤊ 0⤋
6x^2 - 9x + 10x - 15 = 6x^2 + 5x - 6x - 5
x - 15 = -x - 5
2x = 10
x = 5
2007-12-17 16:12:46 · answer #6 · answered by Terry B 7 · 0⤊ 1⤋
square both sides so equation is 3x+1=9+x-4 solve for x = 2
2016-05-24 11:09:15 · answer #7 · answered by ? 3 · 0⤊ 0⤋
Sorry, did this wrong the first time.
I'm getting 5 for my answer.
6x^2+x-15=6x^2-x-5
2x-15=-5
2x=10, x=5
2007-12-17 16:05:41 · answer #8 · answered by Bushman 2 · 0⤊ 1⤋
6x^2 + x - 15 = 6x^2 - x - 5
x- 15 = - x -5
2x-15 = -5
2x= 10
x=5
2007-12-17 16:06:19 · answer #9 · answered by mrr86 5 · 2⤊ 1⤋
6x-9x+10x-15=6x+5x-6x+5
6x-6x+9x-5x+10x-6x+15-5
4x-4x-5
=-5
2007-12-17 16:47:31 · answer #10 · answered by fuck the system 1 · 0⤊ 1⤋