Theory of Quadratic Equation:
In quadratic formula, the expression ………is called the discriminant
of the quadratic equation ax2+bx+c=0
a) b2+4ac
b) b2-4ac
c) b+4ac
d) b-4ac
In quadratic formula, the expression b2-4ac, is called the…………..of the quadratic equation ax2+bx+c=0
a) root
b) solution
c) equation
d) discriminant
The discriminant of quadratic equation is used to determine the ………of quadratic equation.
a) roots
b) solution
c) nature
d) All of above
The discriminant of the quadratic equation x2+9x+2=0
a) 72
b) 70
c)73
d) 59
Solution:x2+9x+2=0
a=1 , b=9 , c=2 b2-4ac
=(9)2– 4(1) (2) = 81-8 =73
The solution to an equation is called the ……… of the equation.
a) roots
b) nature of root
c) equation
d)None of these
