The problem
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why did we use -4 as a substitution for x? is it because 4 is a divisible of 16?
Answer provided by our tutors
There are 2 possible solutions for the equation: 3 and -4.
On the 'Solution check' first the check is done for x = 3 by putting '3' instead of 'x' and all looks good:
We get a true statement '3 = 3' therefore x = 3 is one solution.
Next check is for x = -4 and we get false statement, meaning -4 is not a solution:
