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Answer:

Step-by-step explanation:
a=3, b=-15, c=20
Discriminant can be calculated as


The roots are imaginary
The solution is


The roots are not real i.e these are imaginary
a=3, b=5, c=-8
Discriminant can be calculated as


The roots are real
By quadratic formula method
The solution is



which are required roots.
I choose this method because I can get the solutions directly by substituting the values in formula, and I don't have to guess the possible solutions.
Answer:
the answer is 611.2
how,-3.3x
611.2
=6
there before 614.2 there come always+if there is nothing
then,there is- before-3.3x then rule=
<h3>- + +=-</h3>
so we have to substract it
Answer:
<em>The solution of the system will be:
and
</em>
Step-by-step explanation:
The given system of equations is.......

Multiplying equation (1) by 5 and equation (2) by 2, we will get........

Now, adding equation (3) and (4), we will get.........

Plugging this
into equation (1).........

So, the solution of the system will be:
and 