Question

Is x = 5 a solution of the quadratic equation x² – 2x – 15 = 0?

Answer 1

x² – 2x – 15 = 0

For x = 5 to be solution of the given quadratic equation it should satisfy the equation.

So, substituting x = 5 in the given equation, we get

L.H.S = (5)² – 2(5) – 15

= 25 – 10 – 15

= 0

= R.H.S

Hence, x = 5 is a solution of the quadratic equation x² – 2x – 15 = 0.