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2 answers:
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You must factor.
The factored form is equal to the assigned form.
Values a, b correspond to the factored 1, -1.
Value of x however remains unknown. But we can change that.
Given factored result,
We can set expression equal to 0 then find such x that when added with number a or b results with 0.
Hence x has 2 solutions.
Hope this helps.
Let 
be the random variable representing the number of genes that do get mutated. Here 
denotes a binomial distribution with parameters 
(total number of genes) and 
(probability of mutation).
Then the probability that *at most* 4 genes get mutated is
where
You should find that
Then the probability that *at most* 4 genes get mutated is
where
You should find that