Find the value of x in each case:

x = 17

Step-by-step explanation:

The sum of the angles in a triangle = 180°, thus

∠ECD = 180 - (100 + x) = 180 - 100 - x = 80 - x

∠ACB = 180 - (49 + 4x) = 180 - 49 - 4x = 131 - 4x

∠ECD = ∠ACB ( vertical angles are congruent ), that ia

80 - x = 131 - 4x ( add 4x to both sides )

80 + 3x = 131 ( subtract 80 from both sides )

3x = 51 ( divide both sides by 3 )

x = 17

Step-by-step explanation:

If one solution of a quadratic equation is a complex number (a + bi),

Other solution of the equation will be the conjugate of the first solution.

So the other solution will be in the form of (a - bi)

If one solution is, x = -4 - 5i

Other solution will be, x = -4 + 5i

If one solution is, x = 4 + 5i

Other solution will be, x = 4 - 5i

If one solution is, x = 5 - 4i

Other solution will be, x = 5 - 4i

I believe if wrong sorry :(