1. ## factoring problem..plz help!

it says solve by factoring==> 5x^2+6-11=0

i have no idea how to begin to factor this.

thanks

2. Originally Posted by Candy101
it says solve by factoring==> 5x^2+6-11=0

i have no idea how to begin to factor this.

thanks

3. Originally Posted by Candy101
it says solve by factoring==> 5x^2+6-11=0

i have no idea how to begin to factor this.

thanks
i think you mean $5x^2+6x-11$
$5x^2+6x-11=(x-1)(5x+11).$
I'll let you find the solutions.

4. I do not understand what you mean, Raoh ?
Without the " $= 0$" part, you cannot solve the equation, you can only simplify the expression.

Anyway, one needs to solve :

$5^2 + 6x - 11 = 0$

This can be factorized as :

$(x - 1)(5x + 11) = 0$

Thus the equation becomes :

$x - 1 = 0$ and $5x + 11 = 0$

So the solutions are :

$x = 1$ and $x = \frac{-11}{5}$

EDIT : oh yeah I got it, didn't see he had forgotten an $x$ in his equation Ah well it would have made things simpler

5. Originally Posted by Bacterius
I do not understand what you mean, Raoh ?
Without the " $= 0$" part, you cannot solve the equation, you can only simplify the expression.

Anyway, one needs to solve :

$5^2 + 6x - 11 = 0$

This can be factorized as :

$(x - 1)(5x + 11) = 0$

Thus the equation becomes :

$x - 1 = 0$ and $5x + 11 = 0$

So the solutions are :

$x = 1$ and $x = \frac{-11}{5}$
i only meant the EXPRESSION not the equation.

6. Originally Posted by Raoh
i only meant the EXPRESSION not the equation.
Yep I didn't see it at the moment ..

7. Originally Posted by Bacterius
I do not understand what you mean, Raoh ?
Without the " $= 0$" part, you cannot solve the equation, you can only simplify the expression.

Anyway, one needs to solve :

$5^2 + 6x - 11 = 0$

This can be factorized as :

$(x - 1)(5x + 11) = 0$

Thus the equation becomes :

$x - 1 = 0$ and $5x + 11 = 0$

So the solutions are :

$x = 1$ and $x = \frac{-11}{5}$

EDIT : oh yeah I got it, didn't see he had forgotten an $x$ in his equation Ah well it would have made things simpler
so the answer is actually x= 1 and x=-11/5?

if it is then did i right ( i was trying to do it but i thought i was doing it totally wrong)

8. Originally Posted by Candy101
so the answer is actually x= 1 and x=-11/5?

if it is then did i right ( i was trying to do it but i thought i was doing it totally wrong)
Yes, the solutions are that.
If you are unsure about your factorized form, try expanding it again and check if it matches (with some training this can be performed mentally)

9. Originally Posted by Candy101
so the answer is actually x= 1 and x=-11/5?

if it is then did i right ( i was trying to do it but i thought i was doing it totally wrong)
yes,x=1 or x=-11/5.