Answer:

Explanation:
(x + 5)^2 is the same as (x + 5)(x + 5), which is what you call a binomial expression, since two terms (x + 5) are being multiplied by each other. You can multiply any binomial expression using the FOIL method, where you multiply the first (F), outer (O), inner (I), and last terms and simplify at the end:
First terms: x * x
Outer terms: x * 5
Inner terms: 5 * x
Last terms: 5 * 5
Simplifying:
