Answer:
1/(√x-5)*(√x+5)/(√x+5)
Step-by-step explanation:
1/(√x-5)*(√x+5)/(√x+5)
Answer:
y=20 when x=5
Step-by-step explanation:
you can find the value of y when x is 1
(it'll be 4)
then you can multiply 4 by 5 which is 20
Recall that
![\sin^2a+\cos^2a=1\implies\cos^2a=1-\dfrac49=\dfrac59](https://tex.z-dn.net/?f=%5Csin%5E2a%2B%5Ccos%5E2a%3D1%5Cimplies%5Ccos%5E2a%3D1-%5Cdfrac49%3D%5Cdfrac59)
![\implies\cos a=\pm\dfrac{\sqrt5}3](https://tex.z-dn.net/?f=%5Cimplies%5Ccos%20a%3D%5Cpm%5Cdfrac%7B%5Csqrt5%7D3)
Angle
is acute, which means its measure is between 0 and 90 degrees. For
, we have
, so we should take the positive root. Then
![\cos a=\dfrac{\sqrt5}3](https://tex.z-dn.net/?f=%5Ccos%20a%3D%5Cdfrac%7B%5Csqrt5%7D3)
Since you know Z = 2, you can plug it into:
Y = 5 · Z²
Y = 5 · (2)²
Y = 5 · 4
Y = 20
Now that you know Y = 20, you can plug it into:
X = 2 + 5Y
X = 2 + 5(20)
X = 2 + 100
X = 102
Now that you have X, plug it into "2+2X=?"
2 + 2x = ?
2 + 2(102) = ?
2 + 204 = ?
206 = ?