Answer:
Step-by-step explanation:
First thing you have to do is write those zeros into factors. If
x = 1, then its factor is (x - 1). If
x = 2, then its factor is (x - 2). If
x = -5, then its factor is (x + 5).
Now we FOIL them all together, starting with the first 2:
(x - 1)(x - 2) = 
Combine like terms to get
Now FOIL that with the last factor to get
Combine like terms to get
, which is choice C
This is an example of The Distributive Property.
We can tell this because the number on the outside of the parenthesis on the left side has been distributed to each number inside on the right. You do this by multiplying each number by the number on the outside.
A + b + c = 180
a = 2b
b = c + 4
Substitute the b equation into the a equation
a = 2(c + 4)
a = 2c + 8
Substitute equations a and b into the first equation
2c + 8 + c + 4 + c = 180
4c = 168
c = 42
Find the other angles using c
b = 42 + 4
b = 46
a = 2(42) + 8
a = 92
Therefore angle a is 92 degrees, angle b is 46 degrees, and angle c is 42 degrees.
