Answer:
vertex = (- 10, - 10 )
Step-by-step explanation:
The equation of a quadratic in vertex form is
y = a(x - h)² + k
where (h, k ) are the coordinates of the vertex and a is a multiplier
To obtain this form use the method of completing the square.
Given
h(x) = x² + 20x + 90 
add/subtract ( half the coefficient of the x- term )²
h(x) = x² + 2(10)x + 100 - 100 + 90
       = (x + 10)² - 10 ← in vertex form
with (h, k ) = (- 10, - 10 )
 
        
             
        
        
        
Answer:
1300
Step-by-step explanation:
add 60x2+70+45x3
get 325
multaply times 4 because he gets this stuff then goes back and gets it 3 more times
get 1300
 
        
             
        
        
        
Answer:
The answer to your question is below
Step-by-step explanation:
Data
A (4 , -3)
r = ?
sin = ?
cos = ?
tan = ?
Process
1.- Plot the point 
This point is in the fourth quadrangle
2.- Calculate r
We have the Opposite side and the Adjacent side
        tan Ф = -3/4
        tan⁻¹ Ф = Ф = 323.1 
         Ф = 323.1°
3.- sinФ = 
Calculate the hypotenuse
         c² = 4² + (-3)²
         c² = 16 + 9
         c² = 25
         c = 5
  sinФ = -3/5
cos Ф = 4/5
tan Ф = -3/4