Answer:k^2 + 10k + 25Step-by-step explanation:The expression (k + 5)^2 in mathematics represents the square of the binomial (k + 5). To expand this, you use the formula for squaring a binomial: (a + b)^2 = a^2 + 2ab + b^2. Applying this to the given expression, it expands to k^2 + 10k + 25.