## Thursday, May 30, 2013

Blog-64

Dear Students,

Following two files are very important to improve your base for remembering the formulas. It is 100 % free for all the students of the world. Download these two files, take the Print Out of these files on two sides of the paper and practice these formulas for your benefit to get high scores in Mathematics Standard 10/ Grade 10.

In the Previous Blog we had seen some important concepts of Quadratic Equation.
Some special and critical types of the factors:
Just go through this downloaded file and be prepared to solve any problem pertaining to these critical factors.

c]  Solve the quadratic equation  a x 2 + b x + c = 0 using perfect square method.

Solution:
1) Shift c to RHS we get  a 2 + b x  = - c
2) Dividing the equation by " a " through out
So,   2 + (b / a) x  = - (c / a)                  Here third term = ( 1/2 coefficient of  x ) 2
= ( 1/2 (b / a) 2
= (b / 2 a2
= 2/ 4 a 2

Now we will see few quadratic equation using formula method.
a) Solve the quadratic equation  x 2 - 4 x - 21 = 0.
Solution:
1) Comparing  2 - 4 x - 21 = 0 with a x 2 + b x + c = 0 we get,
a = 1, b = - 4, c = - 21
2) Here Discriminant
=  (- 4 )2 - 4 (1) ( - 21)
=  16 + 84
=  100

Few more problems on Quadratic Equations will be discussed in the next Blog

Anil Satpute