Factor k^2+4k-45

Math
k2+4k-45
Consider the form x2+bx+c. Find a pair of integers whose product is c and whose sum is b. In this case, whose product is -45 and whose sum is 4.
-5,9
Write the factored form using these integers.
(k-5)(k+9)
Factor k^2+4k-45

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