Does anyone know how to factor y^2+49?

(y + 7i) (y - 7i)

Step-by-step explanation:

It cannot be factored using real numbers, but consider

7i * - 7i

= - 49i² and i² = - 1

= 49

The factoring as a difference of squares to obtain

y² + 49 = (y + 7i) (y - 7i)

Y + 7i y-7i