Question

Factorise a⁴-5a²-36​

Answer 1

$\huge\mathfrak{Ello!!!!}$

a⁴-5a²-36

a⁴-9a²+4a²-36

a²( a²-9) +4( a²-9)

( a²+4)( a²-9 )

a²+4=0 , a²-9=0

a²=-4 , a²=9

a=-2 , a=3

______________________♥

Thankuhh★

Answer 2

Easy :)

Step-by-step explanation:

a⁴-5a²-36

a⁴-9a²+4a²-36

a²( a²-9) +4( a²-9)

( a²+4)( a²-9 )

a²+4=0 , a²-9=0

a²=-4 , a²=9

but a square can not be negative. So the first part gives imaginary solution

from part 1 a=+2i and -2i

from second part a= +3 and -3

So a= +2i, -2i, +3, -3

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