Question

factorise this : apower4-bpower4+2bsquare-1​

Answer 1

a⁴-b⁴+2b²-1

(a²)²-{(b²)²-2×1×b²+(1)²}

(a²)²-(b²-1)²

(a²+b²-1)×( a²-b²+1)

(a²+b²-1)×(-1)(a²+b²-1)

(a²+b²-1) (-1)