u=vw+z, for v
At the moment u is the subject because u is out the front by itself.
I think that you are being asked to make v the subject.
When solving, or rearranging equations you basically do PEDMAS in REVERSE
1) subtract z from both sides
2) Divide both sides by w
Now swap sides and V will be out the front by itself.
F(x) = -4x² + 16 x - 8
The x-value of the vertex can be found by using the formula: -b/(2a).
For this problem, a = -4, b = 16, and c = -8.
x-value = -b/(2a) = -16/(2·-4) = -16/-8 = 2
If x = 2, F(2) = -4(2)² + 16(2) - 8 = 8
So, the vertex is (2, 8).
The equation of the line of symmetry is the equation of the vertical line that passes through the vertex. This equation is: x = 2.
To find the size of the angle when you know the cos, use cos-1(0.324).
On hand-held calculators use (2nd) (cos) , enter 0.324 to get the answer: 71.1°.
On this calculator, use (2nd) (acos) and then enter the value.
"acos" means "arc cos", which is the inverse cosine.
Similarly, find sin-1(0.123) and tan-1(0.783), using (2nd) (asin) and (2nd) (atan).