Question 177329
12.{{{9x^5-18x^4=9x^4(x-2)}}} 
{{{ graph( 300, 300, -10, 10, -10, 10, 9x^5-18x^4) }}} 
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13.{{{z^4-16=(z^2+4)(z^2-4)=(z^2+4)(z-2)(z+2)}}}
{{{ graph( 300, 300, -10, 10, -10, 10, x^4-16) }}} 
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14.{{{x^3-27=(x-3)(x^2+3x+9)}}}
{{{ graph( 300, 300, -10, 10, -10, 10, x^3-27) }}}