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Pachacha [2.7K]
3 years ago
11

Find the value of x. (5x+15) (6x-10)

Mathematics
2 answers:
Annette [7]3 years ago
7 0

Answer:

We get x = -5/3 and x = -3

Step-by-step explanation:

(5x+15) (6x-10)

Multiplying this and equating to zero, to find x.

30x^{2} -50x+90x-150=0

30x^{2} +40x-150=0

Factoring out 10.

3x^{2} +4x-15=0

3x^{2} +9x-5x-15=0

3x(x+3)-5(x+3)=0[tex](3x-5)(x+3)=0[/tex]

We get x = -5/3 and x = -3

Blizzard [7]3 years ago
4 0
(5x+15)(6x-10)
= 30x^2 + 30x - 50x - 150
= 30x^2 - 20x - 150
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<em>Comments on the solutions</em>

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  variable term = constant

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You can work these problems by methods that eliminate fractions. Here, the fractions are decimal values, so are not that difficult to deal with. In any event, it is good to be able to work with numbers in any form: fractions, decimals, integers. It can save some steps.

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