plz help

Expanding this would give us

$729x^6+1458ax^5+1215a^2x^4+540a^3x^3+135a^4x^2+18a^5x+a^6$

We know that the $x^4$ is $59535$

So, $1215a^2 = 59535$

Giving us $a^2=49$

$a=\sqrt{49},\:a=-\sqrt{49}$

$a=7,\:a=-7$

-Vinculum