Q. 6.15 Factor by grouping:a) x2+2x-5x-1... [FREE SOLUTION]

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Intermediate Algebra

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OER 2017 Edition 路 1346 pages

ISBN: 9780998625720

Chapter 6: Q. 6.15 (page 571)

Factor by grouping:
a) $x^{2} + 2 x - 5 x - 10$
b) $20 x^{2} - 16 x - 15 x + 12$

Short Answer

Expert verified

a) The factored form is $(x + 2) (x - 5)$ .

b) The factored form is $(5 x - 4) (4 x - 3)$ .

Step by step solution

Part (a) Step 1. Given Information

The given expression is $x^{2} + 2 x - 5 x - 10$ .

Part (a) Step 2. Rewrite the given expression

All four terms do not have the greatest common factor.
Factor the GCF, $x$ from the first 2 terms of the given expression.

$x (x + 2) - 5 x - 10$

Factor the GCF, $- 5$ from the last two terms of the obtained expression.

$x (x + 2) - 5 (x + 2)$

Factor out the common factor $x + 2$ in the obtained expression.

$x (x + 2) - 5 (x + 2) = (x + 2) (x - 5)$

Part (b) Step 1. Given Information

The given expression is $20 x^{2} - 16 x - 15 x + 12$ .

Part (b) Step 2. Rewrite the given expression

All four terms do not have the greatest common factor.
Factor the GCF, $4 x$ from the first 2 terms of the given expression.

$4 x (5 x - 4) - 15 x + 12$

Factor the GCF, $- 3$ from the last two terms of the obtained expression.

$4 x (5 x - 4) - 3 (5 x - 4)$

Factor out the common factor $5 x - 4$ in the obtained expression.

$4 x (5 x - 4) - 3 (5 x - 4) = (5 x - 4) (4 x - 3)$

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91影视

Factor by grouping:
a) $x^{2} + 2 x - 5 x - 10$
b) $20 x^{2} - 16 x - 15 x + 12$

Short Answer

Step by step solution

Part (a) Step 1. Given Information

Part (a) Step 2. Rewrite the given expression

Part (b) Step 1. Given Information

Part (b) Step 2. Rewrite the given expression

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91影视

Factor by grouping:a) x2+2x-5x-10b)20x2-16x-15x+12

Short Answer

Step by step solution

Part (a) Step 1. Given Information

Part (a) Step 2. Rewrite the given expression

Part (b) Step 1. Given Information

Part (b) Step 2. Rewrite the given expression

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Statistics

Applied Mathematics

Decision Maths

Pure Maths

Mechanics Maths

Discrete Mathematics

Study anywhere. Anytime. Across all devices.

Factor by grouping:
a) $x^{2} + 2 x - 5 x - 10$
b) $20 x^{2} - 16 x - 15 x + 12$