Use the drop down menus to find the phase shift. y=2cos(pi/4(x-c))+3
The function is shifted ?
Down
Left
Right
Up
The phase shift of this function is ?
unit(s).
-1
0
1
3

the correct answer is 45x

9×5=45 then add the x

150.6

all i did was i multiplied 5.02 by 30

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81