Students can combine like terms on the left side of the equation, resulting in 12x−3=6(x−3).
Given the equation solved by a student
10x−3+2x=6(x−3)
- The first step that the student could use to solve the expression correctly is to expand the bracket on the right-hand side of the equation using the distributive law as shown:
- The student can also combine like terms on the left side of the equation, to give;
Hence the correct option will be students can combine like terms on the left side of the equation, resulting in 12x−3=6(x−3).
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20%
100%(total points possibly given)
- 80% (points received)
equals 20%
(5*12*12)/2
5*6*12
Assuming simplified means the last answer
360
60% of total = 408 —> 408/.60 —> 680
For an expression to have a rational equivalent when solved, the denominator should not be equal to 0. If the denominator is equal to zero, the expression becomes indefinite or undetermined. This is the reason for the restriction of the use of x being equal to 3 or -10.
In the given above, we can see that the expression x-3 appears both in the numerator and denominator. Hence, this can be cancelled. We are then left with the expression,
(x + 5) / (x + 10)
Therefore, the answer to this item is letter C.
