Answer:
Step-by-step explanation:
f(x)=x^4-11x^2-80=x^4-16x^2+5x^2-80
=x²(x²-16)+5(x²-16)
=(x²-16)(x²+5)
=(x-4)(x+4)[x²-(-5)]
=(x-4)(x+4)[x^2-(5i²)]
=(x-4)(x+4)(x-√5 i)(x+√5 i)
so zeros are 4,-4,√5 i,-√5 i
The answer is option c) 17
x - 5 = 12
x = 12 + 5
x = 17
The answer is c) 17
x = 1
Step 1: Simplify both sides of the equation.
4x−
5
=3
4x+−1=3
4x−1=3
Step 2: Add 1 to both sides.
4x−1+1=3+1
4x=4
Step 3: Divide both sides by 4.
4x
4
=
x=1
cos(3x) = cos(2x+x)
= cos(2x) cos (x) -sin(2x)sin(x)
