Solve each of the equation in Exercises 6 to 9:
21x2 − 28x + 10 = 0
We have,
Now, in order to solve the equation we have to compare this with ax2 + bx + c = 0 where a = 21, b = - 28 and c = 10
Thus, the discriminant of the above given equation is:
D = b2 – 4ac
= (- 28)2 – 4 × 21 × 10
= 784 – 840
= - 56
Hence, the required solutions are:
= 
= 
= 
= 
9