SOLUTION: x(x+3)=(-4x-11)/4 I come up with (x+3)=(-7x)/4 and that is the further I get from there. marie

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: x(x+3)=(-4x-11)/4 I come up with (x+3)=(-7x)/4 and that is the further I get from there. marie      Log On


   

Question 11021: x(x+3)=(-4x-11)/4
I come up with
(x+3)=(-7x)/4
and that is the further I get from there.
marie
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
sorry marie, but your workinf is absolutely wrong...very badly wrong, in fact.

We have x%28x%2B3%29=%28-4x-11%29%2F4 which becomes 4x%28x%2B3%29=%28-4x-11%29 when we multiply BOTH SIDES by 4, to remove the fraction.

Now, we expand the brackets, to see what terms we have, written out fully:
4x%5E2%2B12x+=+-4x-11

Now we collect all like terms together, as
4x%5E2+%2B+16x+=+-11
4x%5E2+%2B+16x+%2B+11+=+0

This is a quadratic equation that needs to be solved. Always try to factorise it first, as this is the simplest method to solve the equation. However, looking at the equation, it does not factorise easily, so you will have to resort to the second method... using the quadratic formula.

I will leave this for you to do.

jon.