Expand and simplify (3x+5)(4x-1)

Please show workings as this is revision for a test and i dont know how to work this kind of questions out.

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26-04-2015
Mathematics

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Expand and simplify (3x+5)(4x-1)

Please show workings as this is revision for a test and i dont know how to work this kind of questions out.

Sagot :

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SpencerTSidn SpencerTSidn · Answer 1 · 2015-04-26T16:28:41-04:00

SpencerTSidn SpencerTSidn

26-04-2015

Use FOIL and simply, First times First, Outside times Outside, Inside times Inside, Last times Last.

(3x+5)(4x-1)
3x * 4x = 12x²
3x * -1 = -3x
5 * 4x = 20x
5 * -1 = -5

12x² - 3x + 20x - 5

Now simplify by adding -3x to 20x and get:

12x² + 17x - 5

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Sagot :

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