Z²(z-1)-9(z-1)
= (z²-9)(z-1)
= (z+3)(z-3)(z-1)
The quadratic formula is the result of completing the square for ax^2+bx+c=0 when a,b, and c are unknown values. This result is:
x=(-b±√(b^2-4ac))/(2a), we have x^2-x-2=0 so
x=(1±√(1+8))/2
x=(1±√9)/2
x=(1±3)/2
x=-1 and 2

Steps:



The correct answer is <u><em>x<-5</em></u>
Hope this helps!!!
Answer:
looks like 9.5, but kinda hard to tell
From the pie chart described, the percent of people that responded that football was their favorite sport to watch is 42% which represents 210 of the people surveyed.
Let the number of people surveyed be x, then

Therefore, the number of people surveyed is 500 people.