Answer:
Step-by-step explanation:
Simplifying
f(x) = 800(0.85) * x
Multiply f * x
fx = 800(0.85) * x
Multiply 800 * 0.85
fx = 680x
Solving
fx = 680x
Solving for variable 'f'.
Move all terms containing f to the left, all other terms to the right.
Divide each side by 'x'.
f = 680
Simplifying
f = 680
Answer: The mistake is improper use of distribution property.
Step-by-step explanation:
It is given that
.
We need to find the mistake.
The given expression is

Using distribution property, we get


So,
.
In the given calculation the 3 is not distributed properly because 3 is not multiplied with 2.
Therefore, the mistake is improper use of distribution property.
Answer:
2b(a+b)
Step-by-step explanation:
(a+b)²-a²+b²=a²+2ab+b²-a²+b²=2ab+2b²=2b(a+b)