Question 807881
{{{ 256r^2 + 289 = 0 }}}
Subtract {{{ 289 }}} from both sides
{{{ 256r^2 = -289 }}}
Divide both sides by {{{ 256 }}}
{{{ r^2 = -289/256 }}}
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{{{ r }}} cannot be a real number because
there is no real number which, if you
square it, you get a negative number.
(+) x (+) = (+)
and, also
(-) x (-) = (+)
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Have you had lessons on imaginary numbers yet?
That's what you need to solve this