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17. Which expression is a factor of 6x² + 7x-5?

A 3x + 5
B 2x + 1
C 6x +1
D x + 5

User Rob Hogan
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1 Answer

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Answer:

A

Explanation:

6x² + 7x - 5

consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term.

product = 6 × - 5 = - 30 and sum = + 7

the factors are - 3 and + 10

use these factors to split the x- term

6x² - 3x + 10x - 5 ( factor the first/second and third/fourth terms )

= 3x(2x - 1) + 5(2x - 1) ← factor out (2x - 1) from each term

= (2x - 1)(3x + 5) ← in factored form

with 3x + 5 being a factor

User Joe Skora
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