Question 9 :
Solve the equation 21x2 – 28x + 10 = 0
Answer
The given quadratic equation is 21x2 – 28x + 10 = 0
On comparing the given equation with ax2 + bx + c = 0, we obtain
a = 21, b = −28, and c = 10
Therefore, the discriminant of the given equation is
D = b2 – 4ac = (−28)2 – 4 × 21 × 10 = 784 – 840 = −56
Therefore, the required solutions are
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