Answer:
<u>B. 7(x − 5)(y + 2)</u>
Explanation:
A. 7(2x − 5)(y + 2) = 14xy + 28x − 35y − 70 (Wrong)
<u><em>B. 7(x − 5)(y + 2) = 7xy + 14x − 35y − 70 (Correct)</em></u>
C. 7(x − 2)(y + 5) = 7xy <u>+</u> 35x− 14y − 70 (Wrong)
D. 7(x − 10)(y + 2) = 7xy + 14x − 70y − 140 (Wrong)
Keywords:
<em>Equation, simplified, variable, compare
</em>
For this case, we have an equation of the form
, where 
. The equation was simplified and we want to find the value of
when the variable
and compare the result of both equations. So:
(1)
We apply distributive property to simplify, taking into account that: 
(2)
If , we substitute in the original equation and in the simplified equation:
1) 
2) 
Thus, when is substituted in both expressions, the result is 6.
Answer:
For and , substituting we have the result is 6.
I think it is 604.4285714285714
