Question

Find the nonpermissible for a in this expression a^2/2a+6

Answer 1

The value not permissible for a is -3.

Explanation:

Considering real numbers, the expression is undefined for any value a for which the denominator expression is zero.

`(a^2)/(2a+6), \,\,\,2a+6\\eq 0\implies a\\eq -3`

The expression is valid for all real numbers, except -3.

Answer 2

a≠-3

Explanation:

We cannot divide by zero, so the denominator cannot be zero

2a+6≠ 0

Subtract 6 from each side

2a+6-6≠ 0-6

2a ≠-6

Divide each side by 2

2a/2 ≠-6/2

a≠-3