1 stack of nickels is S=45gm; given that there are 9 nickels on each stack you can
divide the mass of the stack(
45)
by the
number of nickels in a stack(
9) to
find the
mass of 1 single
nickel
<u>5gm = 1 nickel</u>
R=4 because 20-4 = 16 and 4 times 4 = 16
Answer:
(a + 2b)(a - b)
Step-by-step explanation:
Assuming you require the expression to be factored
Given
a² +
ab - b² ← factor out
from each term
=
(a² + ab - 2b²) ← factor the quadratic
Consider the factors of the coefficient of the b² term(- 2) which sum to give the coefficient of the ab- term (+ 1)
The factors are + 2 and - 1, since
2 × - 1 = - 2 and 2 - 1 = + 1, thus
a² + ab - 2b² = (a + 2b)(a - b) and
a² +
ab - b² =
(a + 2b)(a - b)