Hello,
A cubic polynomial with -2,1,2 as roots is
f(x)=k*(x+2)(x+1)*(x-2)=k(x²-4)(x+1)=k(x^3+x²-4x-4)
Looking the answers ==>k=1
==>Answer A
I hope this help you. Good luck
Answer:
(x + 1)² + (y - 6)² = 50
Step-by-step explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius.
The radius is the distance from the centre to a point on the circle.
Calculate r using the distance formula
r = 
with (x₁, y₁ ) = (- 1, 6) and (x₂, y₂ ) = (- 6, 1)
r = 
= 
= 
= 
(h, k ) = (- 1, 6 ), then
(x - (- 1))² + (y - 6)² = (
)² , that is
(x + 1)² + (y - 6)² = 50 ← equation of circle
Answer: 875
Explaination: in order to find how many words he can read in 25 minutes we need to find how many words he can read in one minute then multiply that by the number of minutes he read. Like this
420÷ 12=35 35x25=875