SOLUTION: The problem is 3x^2 - 10x = 8 I got x = 6 as shown below except when I plug it in it doesn't work. 3x^2/x = 10x+8/x 3x = 18 x = 6

Algebra ->  Expressions-with-variables -> SOLUTION: The problem is 3x^2 - 10x = 8 I got x = 6 as shown below except when I plug it in it doesn't work. 3x^2/x = 10x+8/x 3x = 18 x = 6       Log On


   

Question 92269: The problem is 3x^2 - 10x = 8
I got x = 6 as shown below except when I plug it in it doesn't work.
3x^2/x = 10x+8/x
3x = 18
x = 6

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
3X^2-10X=8
3X^2-10X-8=0
(3X+2)(X-4)=0
3X+2=0
3X=-2
X=-2/3 ANSWER.
X-4=0
X=4 ANSWER.
PROOF
3(-2/3)^2-10*-2/3=8
3(4/9)+20/3=8
12/9+20/3=8
12/9+60/9=8
(12+60)/9=8
72/9=8
8=8
3(4^2)-10*4=8
3*16-40=8
48-40=8
8=8