Answer:
Explanation:
Please, no more than 2 problems per post!
8: (x + 10)(x + 10) = (x + 10)^2. This is the "square of a binomial." There's a formula for this: (a + b)^2 = a^2 + 2ab + b^2, so the final answer here is:
x^2 + 20x + 100
13. (X + 8)(x-8) is a "special product," and the product is the difference of two squares: (X + 8)(x-8) = x^2 + 8x - 8x - 64 = x^2 - 64