Question 472199
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Hi,
 {{{ f(x) = x^4 + 6x^3 + 17x^2 + 54x + 72 }}}
{{{ f(-2) = x^4 + 6x^3 + 17x^2 + 54x + 72 = 0 }}}
(x+2)(x^3 + 4x^2 + 9x + 36) = (x+2)(x+4)(x^2+9) = (x+2)(x+4)(x-3i)(x+3i)