Square of (a + 5a) square of - (5a + 25)

Square of (a + 5a) square of - (5a + 25)

Square of (a square + 5a) = (a ^ 2 + 5A + 5A + 25) (a ^ 2 + 5a-5a-25) = (a ^ 2 + 10A + 25) (a ^ 2-25) = (a + 5) ^ 2 * (a + 5) (a-5) = (a + 5) ^ 3 (a-5)