Answer:
B
Step-by-step explanation:
Quadratic formula is a direct formula which can be remembered .
Second option B is called the quadratic formula .
It can be obtained using the concept of completing squares as well.
The a,b and c are the coefficients in the quadratic equation
[tex]ax^{2}+bx+c[/tex]
It is used to solve the given quadratic for the value of x .
For example if there is an equation
[tex]x^{2} +5x+6 =0[/tex]
we can compare the equation with the standard equation and say
a=1 b=5 and c=6
plugging the values in the quadratic formula gives the solution.
so
B
