Factorise : 9a²-(a²-4)²
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9a²-(a⁴+16-8a²)
9a²-a⁴-16+8a²
17a²-a⁴-16
Or it can be written as
a⁴-17a²+16
a⁴-16a²-a²+16
a²(a²-16)-1(a²-16)
a²-1(a²-16)
Therefore a=1 and 4..
9a²-a⁴-16+8a²
17a²-a⁴-16
Or it can be written as
a⁴-17a²+16
a⁴-16a²-a²+16
a²(a²-16)-1(a²-16)
a²-1(a²-16)
Therefore a=1 and 4..
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