Finding real or imaginary solutions of equations by factoring need help!!!
64x^3=-8

Question

Finding real or imaginary solutions of equations by factoring need help!!!
64x^3=-8

anonymous · Answer

64^3=262144

anonymous · Answer

262144 does not = -8

anonymous · Answer

please medal

anonymous · Answer

That isn't right... there is some kind of technique that I don't understand and I need someone to help me

anonymous · Answer

oh opps i forgot a step

anonymous · Answer

once you have 262144x= -8,  divide both sides by -8

anonymous · Answer

x= - 32768

anonymous · Answer

No.. that's not the kind of algebra I'm working on... I know how to do that. This lesson is something with polynomials and a bunch of crap that doesn't make sense.

solomonzelman · Answer

I don't see why the solutions should be imaginary. They are not!

solomonzelman · Answer

$\large\color{blue}{ 64x^3=-8  }$

$\large\color{blue}{ 4^3x^3=-8  }$

$\large\color{blue}{ (4x)^3=-8  }$

$\large\color{blue}{ (4x)^3=(-2)^3  }$

$\large\color{blue}{ 4x=-2  }$

$\large\color{red}{ x=-\frac{1}{2}  }$