Let i be an imaginary unit and let a, b,c, and d be real numbers. If (a+bi)(c+di)=2, then a not equal to 0 or d not equal to 0. Give a proof using the contrapositive.

the answer is 8

step-by-step explanation:

3.14 x 8x8

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15