Answer:
23
Step-by-step explanation:
7y = 8x - 14
7y= 7(6) Reason : Given
7y = 42
8x -14 = 42 Reason: Because 8x - 14 equals to 7y
8x = 42 + 14 Reason : Because we flip 14 on to the other side of the equation thus it becomes opposute of what it was.
8x = 56
× = 7
Proven
√(3x+4)-3=2 add 3 to both sides
√(3x+4)=5 square both sides
3x+4=25 subtract 4 from both sides
3x=21 divide both sides by 3
x=7
I dont really understood what u hav written in the last part...so i guessed it...hope its right
First of all, we can factor a factor of
from all terms:
![5 (3u^4-4u^3-7u^2)](https://tex.z-dn.net/?f=%205%20%283u%5E4-4u%5E3-7u%5E2%29%20)
Then, we can factor
from all terms:
![5u^2 (3u^2-4u-7)](https://tex.z-dn.net/?f=%205u%5E2%20%283u%5E2-4u-7%29%20)
To factor the quadratic expression in parenthesis, we must find its roots, which are
and
. This implies
![3u^2-4u-7 = 3(u+1)(u-\frac{7}{3})](https://tex.z-dn.net/?f=%203u%5E2-4u-7%20%3D%203%28u%2B1%29%28u-%5Cfrac%7B7%7D%7B3%7D%29)
So, the complete factorization is
![5u^2 \cdot 3(u+1)(u-\frac{7}{3}) = 15u^2(u+1)(u-\frac{7}{3})](https://tex.z-dn.net/?f=%205u%5E2%20%5Ccdot%203%28u%2B1%29%28u-%5Cfrac%7B7%7D%7B3%7D%29%20%3D%2015u%5E2%28u%2B1%29%28u-%5Cfrac%7B7%7D%7B3%7D%29%20)