c = - 1
substitute x = 2 into f(x ) and equate to 7
2(2)³ - 4(2)² + 4(2) + c = 7
16 - 16 + 8 + c = 7
8 + c = 7
subtract 8 from both sides
c = 7 - 8 = - 1
Sec^2 x = 1 + tan^2 x
tan^2 x = sec^2 x - 1
tan x = sqrt ( sec^2 x - 1) answer
Answer:
answer is
x1= 1/2 + 1/2 * i *sqrt(5)
x2= 1/2 - 1/2 * i *sqrt(5)
Step-by-step explanation:
Please refer to the attached picture for the procedure
Keep in mind, that the first step to use the quadratic formula is to rearrange the terms.