SOLUTION: Can someone please help with these few question step by step? I work them out,but it doesn't add up. 8x^2-64=0 x= 0.7x^2=175 x= 4.8x^2=8 x= 2.56x^2=20 x= x^2+8x=16

Question 966747: Can someone please help with these few question step by step? I work them out,but it doesn't add up.
8x^2-64=0 x=
0.7x^2=175 x=
4.8x^2=8 x=
2.56x^2=20 x=
x^2+8x=16 x=

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
8x^2-64=0
8x^2 = 64
x^2 = 8
x = +/- sqrt(8)
------------
0.7x^2=175
x^2 = 250
etc
------
4.8x^2=8 x=
Same as above
-----
2.56x^2=20 x=
Same as above
------
x^2+8x=16
x^2 + 8x - 16 = 0

Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=128 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 1.65685424949238, -9.65685424949238. Here's your graph:

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