Answer:
x² + x - 30
Step-by-step explanation:
Given
(x - 5)(x + 6)
Each term in the second factor is multiplied by each term in the first factor, that is
x(x + 6) - 5(x + 6) ← distribute both parenthesis
x² + 6x - 5x - 30 ← collect like terms
= x² + x - 30
The answer is i thinks x=3
16 bc one side is 5ft so the other must be 3 to have an area of 15. Then 5+5+3+3= 16ft