RS Aggarwal - Mathematics

Book: RS Aggarwal - Mathematics

Chapter: 10. Quadratic Equations

Subject: Maths - Class 10th

Q. No. 9 of Exercise 10A

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9

Solve each of the following quadratic equations:

x2 + 6x + 5 = 0


Using the splitting middle term - the middle term of the general equation is divided in two such values that:


Product = a.c


For the given equation a = 1, b = 6, c = 5


= 1.5 = 5


And either of their sum or difference = b


= 6


Thus the two terms are 1 and 5


Sum = 5 + 1 = 6


Product = 5.1 = 5




x(x + 1) + 5(x + 1) = 0


(x + 1)(x + 5) = 0


(x + 1) = 0 or (x + 5) = 0


x = -1, x = -5


Roots of equation are - 1, - 5


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