SOLUTION: HELP PLEASE I DONT UNDERSTAND Solve: 3x^2-21x+30=0 20y^2+33y+10=0

Question 849226: HELP PLEASE I DONT UNDERSTAND
Solve:
3x^2-21x+30=0
20y^2+33y+10=0
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
and are quadratic equations.

Some quadratic equations can be simplified.
Dividing both sides of the equal sign by we can transform
into the simpler equivalent equation
.
That equation can be easily solved by factoring,
because ,
so we can rewrite as the equivalent equation
.
Then, if the product of and is zero,
either -->
or --> .

cannot be simplified.
Maybe we could solve it by factoring, but it seems difficult.
For such a quadratic equation, I would use the quadratic formula.
The quadratic formula says that the solution to
, if it exists, is given by

is with instead of ,
, and so we try to calculate
as

The solutions are:
or
and
or
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