7/7q+21= x /5q^2-45 then x=?

Mathematics

1 answer:

anzhelika [568]2 years ago

3 0

Answer:

x = 5q - 15

Step-by-step explanation:

$\frac{7}{7q+21}=\frac{x}{5q^{2}-45}\\\\\frac{7}{7(q+3)}=\frac{x}{5 (q^{2} -9)}\\\\frac{1}{q+3}=\frac{x}{5*(q^{2}-3^{2})}\\\\\frac{1}{q+3}=\frac{x}{5(q+3)(q-3)}\\\\\frac{1}{q+3}*5*(q+3)(q-3)=x\\\\5(q-3)=x\\\\x= 5q-15$

You might be interested in

Please help this is due

Kaylis [27]

Answer:

it's either A or B so try B

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

Can somebody help me ?

nata0808 [166]

You are solving quadratic equations. to do so, use the quadratic formula when possible, or factor. 15- for example, you can factor (x+5)(x+3), therefore x=-5,-3. You then go back and plug in your answers to see if you can eliminate any of them.

6 0

3 years ago

He has 2yards of the string .He cut 5 /8 yards of the string for his project how much left

belka [17]

It would probably be 1 and 3/8 yards of string left because if he cut 5/8 yards of the string it would be a subject of subtraction, so if you would subtract that amount from 2 yards, the answer would be 1 and 3/8 yards of string left, hope this helps, good luck

6 0

2 years ago

Read 2 more answers

Solve the system of linear equations. separate the x- and y- values with a coma.

Katarina [22]

The Answer is x=7, y=6

Solve the following system:
{14 x - 4 y = 74 | (equation 1)
{7 x - 7 y = 7 | (equation 2)
Subtract 1/2 × (equation 1) from equation 2:
{14 x - 4 y = 74 | (equation 1)
{0 x - 5 y = -30 | (equation 2)
Divide equation 1 by 2:
{7 x - 2 y = 37 | (equation 1)
{0 x - 5 y = -30 | (equation 2)
Divide equation 2 by -5:
{7 x - 2 y = 37 | (equation 1)
{0 x+y = 6 | (equation 2)
Add 2 × (equation 2) to equation 1:
{7 x+0 y = 49 | (equation 1)
{0 x+y = 6 | (equation 2)
Divide equation 1 by 7:
{x+0 y = 7 | (equation 1)
{0 x+y = 6 | (equation 2)
Collect results:
Answer: {x = 7
{y = 6

P{lease note the brackets are supposed to go over both equations but I haven'y been able to find a way to make it work, see attachment.

7 0

2 years ago

What is the value of x?

fiasKO [112]

Answer:

x=23

Step-by-step explanation:

2x+3=49

2x=49-3

2x=46

x=23

6 0

2 years ago

7/7q+21= x /5q^2-45 then x=?​

7/7q+21= x /5q^2-45 then x=?