Question

2t^2+5t+?=0

How can i get the 3rd term?

Answer 1

You can complete the square

Answer 2

the third term could be anything (unless we have more info)
if we assume this equation is in standard form, the third term would be a number (with no "t" variable)
for example, it could be 0, 1, 2, or pi , etc

Answer 3

if we know the expression is a "perfect square" then we would do as astro suggests.

Answer 4

So if you have \[x^2+ax=0\] we can do the following \[x^2+\frac{ 2ax }{ 2 } + \left( \frac{ a }{ 2 } \right)^2-\left( \frac{ a }{ 2 } \right)^2=0\] (complete the square)

Answer 5

your correct!