Q 7.42. Factor:聽k2+k-20... [FREE SOLUTION]

91影视

Elementary Algebra

Lynn Marecek, MaryAnne Anthony-Smith

$Math Studyset 91影视 Explanations$ Math

2nd Edition 路 1240 pages

ISBN: 9780998625713

Chapter 7: Q 7.42. (page 826)

Factor: $k^{2} + k - 20$

Short Answer

Expert verified

The factorization of $k^{2} + k - 20$ is, $(k + 5) (k - 4)$ .

Step by step solution

Step 1. Given information

The given expression is $k^{2} + k - 20$ .

Step 2. Find the last terms of the binomials

Write the factors as two binomials with the first terms $k$ .

$(k) (k)$

Find two numbers that multiply to $- 20$ and add to 1.

Factors of -20	Sum of factors
1, -20	1 + (-20) = -19
2, -10	2 + (-10) = -8
4, -5	4 + (-5) = -1
-1, 20	-1 +20 = 19
-2, 10	-2 + 10 = 8
-4, 5	-4 + 5 = 1*

Step 3. Factorization

Use $5$ and $- 4$ as the last terms of the binomials.

$k^{2} + k - 20 = (k + 5) (k - 4)$

Step 4. Check

$(k + 5) (k - 4) = k^{2} + 5 k - 4 k - 20 = k^{2} + k - 20$

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91影视

Factor: $k^{2} + k - 20$

Short Answer

Step by step solution

Step 1. Given information

Step 2. Find the last terms of the binomials

Step 3. Factorization

Step 4. Check

One App. One Place for Learning.

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91影视

Factor:k2+k-20

Short Answer

Step by step solution

Step 1. Given information

Step 2. Find the last terms of the binomials

Step 3. Factorization

Step 4. Check

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Mechanics Maths

Geometry

Calculus

Pure Maths

Statistics

Decision Maths

Study anywhere. Anytime. Across all devices.

Factor: $k^{2} + k - 20$