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Find the roots of the following quadratic equations, if they exist, by the method of completing the square 2x^2 – 7x + 3  = 0 - CBSE Class 10 - Mathematics

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Question

Find the roots of the following quadratic equations, if they exist, by the method of completing the square 2x2 – 7x + 3  = 0

Solution

2x2 – 7x + 3 = 0

⇒ 2x2 – 7x = - 3

On dividing both sides of the equation by 2, we get

`⇒ x^2 – (7x)/2 = -3/2`

`⇒ x^2 – 2 × x × 7/4 = -3/2`

On adding (7/4)2 to both sides of equation, we get

`⇒ (x)^2 - 2 × x × 7/4 + (7/4)^2 = (7/4)^2 - 3/2`

`⇒ (x - 7/4)^2 = 49/16 - 3/2`

`⇒ (x - 7/4)^2 = 25/16`

`⇒ (x - 7/4) = ± 5/4`

`⇒ x = 7/4 ± 5/4`

`⇒ x = 7/4 + 5/4 or x = 7/4 - 5/4`

`⇒ x = 12/4 or x = 2/4`

⇒ x = 3 or 1/2

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 10 (2019 to Current)
Chapter 4: Quadratic Equations
Ex.4.30 | Q: 1.1 | Page no. 87
Solution Find the roots of the following quadratic equations, if they exist, by the method of completing the square 2x^2 – 7x + 3  = 0 Concept: Solutions of Quadratic Equations by Completing the Square.
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