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Thomas Clements
Mathematics
25 November, 13:19
What is the factor of k2 + k - 42
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Answers (
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Branden Pace
25 November, 13:30
0
(k + 7) • (k - 6)
Step-by-step explanation:
Final result:
(k + 7) • (k - 6)
Reformatting the input:
Changes made to your input should not affect the solution:
(1) : "k2" was replaced by "k^2".
Step by step solution:
Step 1:
Trying to factor by splitting the middle term
1.1 Factoring k2+k-42
The first term is, k2 its coefficient is 1.
The middle term is, + k its coefficient is 1.
The last term, "the constant", is - 42
Step-1 : Multiply the coefficient of the first term by the constant 1 • - 42 = - 42
Step-2 : Find two factors of - 42 whose sum equals the coefficient of the middle term, which is 1.
-42 + 1 = - 41
-21 + 2 = - 19
-14 + 3 = - 11
-7 + 6 = - 1
-6 + 7 = 1 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, - 6 and 7
k2 - 6k + 7k - 42
Step-4 : Add up the first 2 terms, pulling out like factors:
k • (k-6)
Add up the last 2 terms, pulling out common factors:
7 • (k-6)
Step-5 : Add up the four terms of step 4:
(k+7) • (k-6)
Which is the desired factorization
Final result:
(k + 7) • (k - 6)
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