𝑥^2 − 21𝑥 + 90
We can further write it as
= 𝑥^2 − 6𝑥 − 15𝑥 + 90
By taking out the common terms
= x (x – 6) – 15 (x – 6)
So we get,
= (x – 15) (x – 6)
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