Please help :( what’s the answer?? math
1 answer:
You might be interested in
Answer:
110
Step-by-step explanation:
Using the expansion
(a + b)³ = a³ + b³ + 3ab(a + b)
Given
x + = 5 ( cube both sides )
(x + )³ = 5³ = 125 ← expand left side using identity
x³ + + 3(x ×
)(x +
) = 125
x³ + + 3(1)(5) = 125
x³ + + 15 = 125 ( subtract 15 from both sides )
x³ + = 110
STEP - BY - STEP EXPLANATION
What to find?
An expression for the total number of books.
Given:
Number of shelves = 5
Number of books in each shelf = k
If Lucy has a bookcase with 5 shelves and each of this
shelf has k books, then the total number of books can be determine by multiplying the numbers of book by the numbers of shelves.
That is;
ANSWER
5K