Answer: x=4
Step-by-step explanation: Look at pic below to see how solved.
Answer:
The answer is D.
Step-by-step explanation:
First you have to get rid of brackets by expanding :
![3 {q}^{2} + {r}^{3} + 5r - 8q + 2( {q}^{2} + r)](https://tex.z-dn.net/?f=3%20%7Bq%7D%5E%7B2%7D%20%20%2B%20%20%7Br%7D%5E%7B3%7D%20%20%2B%205r%20-%208q%20%2B%202%28%20%7Bq%7D%5E%7B2%7D%20%20%2B%20r%29)
![= 3 {q}^{2} + {r}^{3} + 5r - 8q + 2 {q}^{2} + 2r](https://tex.z-dn.net/?f=%20%3D%203%20%7Bq%7D%5E%7B2%7D%20%20%2B%20%20%7Br%7D%5E%7B3%7D%20%20%2B%205r%20-%208q%20%2B%202%20%7Bq%7D%5E%7B2%7D%20%20%2B%202r)
Next you have to simplify by collecting like terms :
![{r}^{3} + 3 {q}^{2} + 2 {q}^{2} + 5r + 2r - 8q](https://tex.z-dn.net/?f=%20%7Br%7D%5E%7B3%7D%20%2B%20%203%20%7Bq%7D%5E%7B2%7D%20%20%2B%202%20%7Bq%7D%5E%7B2%7D%20%20%2B%205r%20%2B%202r%20-%208q)
![= {r}^{3} + 5 {q}^{2} - 8q + 7r](https://tex.z-dn.net/?f=%20%3D%20%20%7Br%7D%5E%7B3%7D%20%20%2B%205%20%7Bq%7D%5E%7B2%7D%20%20-%208q%20%2B%207r)
Answer:
x = 6
Step-by-step explanation:
If A, B and C lies on a straight line in order, then;
AB+BC = AC
x+12+2x-4 = 26
x+2x+12-4 =26
3x+8 = 26
3x = 26-8
3x = 18
x = 18/3
x = 6
Hence the value of x is 6