𝑥^2 − 3√5𝑥 − 20
We can further write it as
= 𝑥^2 − 4√5𝑥 + √5𝑥 − 20
By taking out the common terms
= x (x -4√5) + √5 (x -4√5)
So we get,
= (x +√5) (x -4√5)
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