Answer:
x = -2 ± sqrt(5)
Step-by-step explanation:
x^2 + 4x – 1= 0
Add 1 to each side
x^2 + 4x – 1+1= 0+1
x^2 +4x = 1
Take the coefficient of x
4
Divide by 2
4/2 =2
Square it
2^2=4
Add it to each side
x^2 +4x+4=1+4
(x+2)^2 = 5
Take the square root of each side
sqrt((x+2)^2 )=± sqrt(5)
x+2 = ± sqrt(5)
Subtract 2 from each side
x+2-2 = -2 ± sqrt(5)
x = -2 ± sqrt(5)
Answer: 300π
Step-by-step explanation: Volume=(pi)(radius^2)(height)
Volume=(pi)(5^2)(12)
V=(pi)(25)(12)
V=(pi)(300)
<span>1.7 = (1 x 1) + (7/10)
Hope this helps! Could I gent a Brainliest?
</span>
Answer:
4y-x+6
Step-by-step explanation:
Answer:
![l= \frac{A}{2h} -w](https://tex.z-dn.net/?f=l%3D%20%5Cfrac%7BA%7D%7B2h%7D%20-w)
Step-by-step explanation:
The question is not correct (particularly the expression for the area)
A=2lh+2wh
Now we are expected to solve for l, that is we are going to make l subject of the formula, we have
let us take the second term on the RHS to the LHS
![A-2wh= 2lh](https://tex.z-dn.net/?f=A-2wh%3D%202lh)
we can now divide both sides by 2h we have
![\frac{A-2wh}{2h} = l\\\\l=\frac{A}{2h} -\frac{2wh}{2h} \\\\l= \frac{A}{2h} -w](https://tex.z-dn.net/?f=%5Cfrac%7BA-2wh%7D%7B2h%7D%20%3D%20l%5C%5C%5C%5Cl%3D%5Cfrac%7BA%7D%7B2h%7D%20-%5Cfrac%7B2wh%7D%7B2h%7D%20%5C%5C%5C%5Cl%3D%20%5Cfrac%7BA%7D%7B2h%7D%20-w)
hence the expression for the length is ![l= \frac{A}{2h} -w](https://tex.z-dn.net/?f=l%3D%20%5Cfrac%7BA%7D%7B2h%7D%20-w)