Quadratic Equation (Check my Workings ?)

[lloydowen]

Homework Statement

Solve using the formula method.

Homework Equations

$3t^2+7t=5$

The Attempt at a Solution

$3t^2+7t-5=0<br /> t= \frac{-7 +or-\sqrt{7^2-4(3)(-5)}}{2(3)}<br /> <br /> t= \frac{-7+\sqrt{109}}{4}<br /> t= -4.39$ OR...
$t= \frac{-7-\sqrt{109}}{4}<br /> t= -9.61$

The reason I have doubts is because the answer book from the tutor shows, T= 0.573 or -2.907... ? :(

 

[lloydowen]

Ah ****, misuse of the formula tags, :( For some reason it won't let me go back and edit, hope you guys can understnad that :/

 

[eumyang]

$3t^2+7t-5=0<br /> t= \frac{-7 +or-\sqrt{7^2-4(3)(-5)}}{2(3)}<br /> <br /> t= \frac{-7+\sqrt{109}}{4}<br /> t= -4.39$ OR...
$t= \frac{-7-\sqrt{109}}{4}<br /> t= -9.61$

The reason I have doubts is because the answer book from the tutor shows, T= 0.573 or -2.907... ? :(

In the denominator, 2(3) does not equal 4.

 

[lloydowen]

Oh! Such a silly mistake, I feel like a fool now !