Expanding the square of the binomial (x + 5)^2, we get:
(x + 5)^2 = (x + 5)(x + 5) = x^2 + 10x + 25
Now, let's subtract (x + 5)^2 from 6x^2 + 3:
(6x^2 + 3) - (x^2 + 10x + 25)
Simplifying, we get:
6x^2 + 3 - x^2 - 10x - 25
Combining like terms, we get:
5x^2 - 10x - 22
Therefore, the result of subtracting (x + 5)^2 from 6x^2 + 3 is 5x^2 - 10x - 22, written in standard form.