What are the real and complex solutions to the following equation? -2x^4+2x^2+4=0 Show all steps.

u=±1i or u=±√2

u=±2i or u=±√2

x = ± i, x = ±

Step-by-step explanation:

Given

- 2 + 2x² + 4 = 0 ( divide through by - 2 )

- x² - 2 = 0

Use the substitution x² = u , then

u² - u - 2 = 0 ← in standard form

(u - 2)(u + 1) = 0 ← in factored form

Equate each factor to zero and solve for u

u - 2 = 0 ⇒ u = 2

u + 1 = 0 ⇒ u = - 1

Change back into terms of x, that is

x² = 2 ( take the square root of both sides )

x = ±

x² = - 1 ( take the square root of both sides )

x = ± = ± i

x = ± ← real solutions

x = ± i ← complex solutions

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation: