Factorise :
32a4−8a232a^4 - 8a^232a4−8a2
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32a4−8a2=8a2(4a2−1)=8a2((2a)2−12)=8a2(2a−1)(2a+1)32a^4 - 8a^2 = 8a^2(4a^2 - 1)\\[1em] = 8a^2((2a)^2 - 1^2)\\[1em] = 8a^2(2a - 1)(2a + 1)32a4−8a2=8a2(4a2−1)=8a2((2a)2−12)=8a2(2a−1)(2a+1)
Hence,32a4−8a2=8a2(2a−1)(2a+1)32a^4 - 8a^2 = 8a^2(2a - 1)(2a + 1)32a4−8a2=8a2(2a−1)(2a+1).
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