Question 6533
this is just a quadratic...let {{{a=b^2}}}, so the equation becomes


{{{a^2 + a - 20 = 0}}}


so, now factorise to (a+5)(a-4) = 0

--> a = -5 or a = 4


so {{{b^2 = 4}}} or {{{b^2 = -5}}}


so b = +2 or -2 or b = +{{{sqrt(5)i}}} or -{{{sqrt(5)i}}}


jon.