How do you solve 15r ^ { 2} - 21r - 18= 0?
2 Answers
Explanation:
All the monomials in the equation
To solve this, we should first factorize LHS, where we have a quadratic polynomial. As the coefficients of
It is apparent that these are
or
or
or
Note : In case signs of the coefficients of
Explanation:
First of all divide everything by
Use the quadratic formula:
In this case