Factorise by grouping method :
a(a - 4) - a + 4
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Given,
= a(a - 4) - 1(a - 4)
= (a - 1)(a - 4).
Hence, a(a - 4) - a + 4 = (a - 1)(a - 4).
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Factorise :
9x2 + 3x - 8y - 64y2
2(ab + cd) - a2 - b2 + c2 + d2