Question

check whether x=-3 is the root of the quadratic equation x^2+4=13​

Answer 1

Answer:

Given :

P ( x ) = x² + 4 = 13

If - 3 is root of equation then it must satisfy the condition.

P ( - 3 ) = ( - 3 )² + 4

P ( - 3 ) = 9 + 4

P ( - 3 ) = 13

Since it satisfied the condition which is right hand is equal to 13 .