Answer:
-10xsquared-x+38
Step-by-step explanation:
so,
general eqn of quadratic equation is,
axsquared+bx+c=y
where,
x and y are exchanged by coordinates given in qn
1,64a-8b+c=0
2,4a-2b+c=0
or c=2b-4a
60a-6b=0
3,36a-6b+c=8
32a-4b=8
24.5 is the answer
The answer is the first option: I, II and III.
The explanation is shown below:
1. By definition, there is a joint variation when a variable depends on two or more different variables. Therefore, you can express it as following:
Where and are the variables and is the constant of proportionality.
As you can see, is directly proportional to and .
2. Keeping the information above, you have:
I) ( varies jointly with , and .
II) (If is the constant of proportionality, varies jointly with and ).
III) ( varies jointly with and .
x is greater or equal to 7
x=3; x=-3; x=√5; x=-√5