6x^2-10x-16=0?
3 Answers
Solve the quadratic to get
Explanation:
I assume the question wants the solutions for
Divide through to make the first coefficient 1:
Complete the square:
So
Since a - b + c = 0, use shortcut.
The 2 real roots are:
x = -1 ,and
Reminder of shortcut .
If a + b + c = 0, the 2 real roots are: x = 1, and
Example 1. Solve:
x = 1, and
If a - b + c = 0, the 2 real roots are: x = -1, and
Example 2. Solve:
x = -1, and
Another way
Explanation:
if
In this case