Question 84

Which of the following equations has the sum of its roots as 7?

Solution

In a quadratic equation of the form : $$ax^2 + bx + c = 0$$, the sum of the roots is given by = $$\frac{-b}{a}$$

= Ratio of negative coefficient of $$x$$ to coefficient of $$x^2$$

In equation (B) : $$x^{2} - 7x + 10 = 0$$

=> Sum of roots = $$\frac{-(-7)}{1} = 7$$

=> Ans - (B)

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