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It's positive, since it's a negative times a negative.

PS Don't feel stupid, forgeting simple things happens a lot to me. 

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Postive......

Example .....   (-7) (-7)   = 49

4^x + 4^-x = 2

4^x + 4^-x - 2 = 0 

4^x + 1/4^x - 2 = 0     multiply through by 4^x

4^2x - 2*4^x + 1  = 0        let 4^x = u

u^2 - 2u + 1 =  0   factor

(u - 1)^2  = 0      take the square root of both sides

u - 1  = 0

u = 1    so

4^x = 1      which implies that x  = 0

Check....    4⁰ + 4^-0  = 4⁰ + 4⁰  =   1 + 1  = 2

16/5

14x=-129.5

x=-129.5/14

x=-9.25

The frist equation.......it's slope = 4

The second equation has a lesser slope [i.e., 3 ]

I calculated this and the answer is \(0.000262144\).

Let x, y be the two numbers

x + y = 100

x - y = 6

Add both equations

2x  = 106    divide both sides by 2

x = 53

And 53 - y = 6   →  53 - 6 = y = 47

Rounded to...

Whole: 4

Tenth:  3.5

Hundreth: 3.54

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Secret Message (unscramble it first!)

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No.

yes

Hey Omi67.....when I substitute your answer into the equation I get  -2    NOT   2  ......Hmmmmmm

I question this step(s)

Substitution  4x = u

u^2 - 2u -1 = 0                 u^2 would be 16x^2   NOT     4^(2x)         right???