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Question 5
Which of the following equations has the sum of its roots as 3?
(a)
2x23x+6=0
(b) x2+3x3=0
(c) 2x232x+1=0
(d)
3x23x+3=0​​​​​​​


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Solution

a) Given that, 2x23x+6=0
On comparing with ax2 + bx + c = 0, we get
a = 2, b = 3 and c = 6
Sum of the roots =ba=(3)2=32
So, sum of the roots of the quadratic equation 2x2 – 3x + 6 = 0 is not 3, so it not the answer
b) Given that, x2 + 3x – 3 = 0
On compare with ax2 + bx + c = 0, we get
a = -1, b = 3 and c = - 3
sum of the roots =ba=(3)1=3
So, sum of the roots of the quadratic equation x2+3x3 is 3, so it is the answer.
c) Given that 2x232x+1=0
2x23x+2=0
On comparing with ax2 + bx + c = 0, we get
a = 2, b = - 3 and c = 2
sum of the roots =ba=(3)2=32
So, sum of the roots of the quadratic equation 2x232x+1=0 is not 3, so it is not the answer.
d) Given that, 3x2 – 3x + 3 = 0
x2x+1=0
On comparing with ax2 + bx + c = 0 get
a = 1, b = - 1 and c = 1
sum of the roots =ba=(1)1=1
So, sum of the roots of the quadratic equation 3x2 - 3x + 3 = 0 is not 3, so it is not the answer.


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