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Factor the polynomial: k^2 – 13k – 30

Sagot :

Since the constant is negative then the roots have different signs.
We need to find two numbers who would have a product of -30 and have a sum of -13, and we would find out that the two will be -15 and 2
So: 
[tex]k^2-13k-30=(k-15)(k+2)[/tex]