1. Apr 23, 2014

### Atomised

1. The problem statement, all variables and given/known data

Solve 5x^2 - 16tx + 3t^2 for x without using quadratic formula.

I am interested in understanding the technique - I have the answers already: t/5, 3t

2. Relevant equations

I have solved the subsequent question which is:

tx^2 + (tT - 1)x - T = 0, which seems easier because it breaks into four clusters which can be factored, then refactored and solved. The one I am asking about does not seem amenable to the same approach, or any other that I know.

3. The attempt at a solution

I am interested in higher maths but having to mend holes in elementary technique. Thanks in advance.

Last edited: Apr 23, 2014
2. Apr 23, 2014

### mpittma1

is the whole equation 5x^2 - 16tx + 3t^2=0?

3. Apr 23, 2014

### scurty

Since 5 and 3 are both prime, you only have 4 different possibilities of how the terms appear when you use the factor method. Perhaps the variable t is throwing you off? Start by letting t = 1 just so it's clearer to you and then go back and solve the equation with t.

Also, you can only solve for a variable if you have an equation. The original expression must be set equal to 0.

4. Apr 23, 2014

### Atomised

Yes - the only other info stated in the question is 'Express x in terms of the other letters'.

5. Apr 23, 2014

### Atomised

Ah apologies - I have only stated the LHS, the equation is

5x^2 - 16tx + 3t^2=0

Last edited: Apr 23, 2014
6. Apr 23, 2014

### Atomised

Thank you Scurty, the t was throwing me.

(5x - t) (x - 3t)