Q. 125.0( 2 Votes )

# The roots of a quadratic equation are 5 and - 2. Then, the equation isA. x2 - 3x + 10 = 0B. x2 - 3x - 10 = 0C. x2 + 3x - 10 = 0D. x2 + 3x + 10 = 0

Answer :

The roots of a quadratic equation will satisfy the equation - start with option 1

A. x2 - 3x + 10 = 0

For x = 5

52 - (3.5) + 10

25 - 15 + 10 = 20 ≠ 0

Hence this is not the equation

B. x2 - 3x - 10 = 0

For x = 5

52 - (3.5) - 10 = 25 - 15 - 10

= 25 - 25 = 0

For x = - 2

= ( - 2)2 - (3. - 2) - 10

= 4 + 6 - 10 = 10 - 10 = 0

This equation is satisfied for both the roots.

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