𝑥^2 − 𝑥 − 156
We can further write it as
= 𝑥^2 − 13𝑥 + 12𝑥 − 156
By taking out the common terms
= x (x – 13) + 12 (x – 13)
So we get,
= (x + 12) (x – 13)
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