Use the quadratic formula to solve the equations:
Write as
and then as
and compare to this form which you must memorize:
We see that A=1, B=1, C=-20. and we substitute into
this formula which you must also memorize:
Use the + for the first solution:
That's the first solution.
Use the - for the second solution:
That's the second solution.
There are two solutions x = 4 and x = -5.
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The other one is solved the same way.
The solutions to it are x = 3 and x = 2
Edwin
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Use the quadratic formula to solve:
1) Here, a = 1, b = 1, and c = -20, make the appropriate substitutions to get:
Evaluate.
or
or
Use the same approach on the second equation.
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