Note that algebraic expressions are mathematical expressions involving constants, variables and algebraic operations
(subtraction,addition,multiplication,division&exponentiation)
examples:
1.) (x + 5)(x - 5)
using distributive property you'll have
x² - 5x + 5x - 25
x² - 25
2.) x²y (x + y)
using distributive property you'll have
x³y + x²y²
3.) 6a(x + y + z)
using distributive property you'll have
6ax + 6ay + 6az
4.) yz( xy² + 1)
using distributive property you'll have
xy³z + yz
5.) ac(b+1)
using distributive property you'll have
abc + ac