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DaniilM [7]
2 years ago
5

How to do 2/5 = (x-3)/(7x+15)

Mathematics
2 answers:
Zigmanuir [339]2 years ago
6 0

Answer:

x =  - 5

Step-by-step explanation:

To work out this question you have to first cross multiply.

\frac{2}{5} =  \frac{(x - 3)} {(7x + 15)}  \\ \\  2(7x + 15) = 5(x - 3)

When you cross multiply you will get the equation above. Therefore

(2 \times 7x) + (2 \times 15) = (5 \times x) \\   - (5 \times  3) \\ \\ 14x + 30 = 5x - 15 \\ \\ 14x - 5x =  - 30 - 15 \\ \\ 9x =  - 45

Therefore

\frac{9}{9} x =  \frac{ - 45}{9}  \\ \\ x =  - 5

Serggg [28]2 years ago
3 0

Answer:

x = -5

Step by step:

multiply both side by 7x + 15.

2/5 (7x+15)= x − 3

Simplify 2)5 (7x+15) to 2(7x+15)/5.

2(7x+15)/5= x - 3

multiply both sides by 5.

2(7x+15)= 5x - 15

Expand.

14x+30= 5x - 15

subtract 5x from both sides.

14x+30−5x= − 15

Simplify 14x + 30 - 5x14x + 30−5x to 9x + 309x + 30.

9x+30= - 15

Subtract 30 from both sides.

simplify

x = -5

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Use synthetic division method to divide the polynomial by (x+1).

The last row of the synthetic division shows the coefficient of remaining polynomial.

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