The formula to find the discriminant equals D = b^2-4ac.
(Quadratic equations have the formula ax^2+bx+c. A = -1, B = +4, C = -2.)
D = 4^2-4(-1)(-2). 8-8 = 0.
0 = 1 solution
-D = 0 solutions
+D = 2 solutions
The discriminant equals 0, also establishing that if you were asked to find the solutions, there would only be one.
Answer:

Step-by-step explanation:
<u><em>Given that:</em></u>
R is a point lying on line TS
So,
TS = TR + RS
Where TR = 4.5 and RS = 6
=> TS = 4.5 + 6
=> TS = 10.5
Answer:

Step-by-step explanation:
<em>We use the rule
to first simplify this:</em>

<em>Now we use the rule
we simplify further and find the answer:</em>

The third answer choice is right.
Answer is k=ba because multiply b on both sides to get rid of it as a denominator.