Factorise the following:
4x2 - 25y2
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4x2 - 25y2 = (2x)2 - (5y)2.
Using identity,
a2 - b2 = (a + b)(a - b).
(2x)2 - (5y)2 = (2x + 5y)(2x - 5y).
Hence, 4x2 - 25y2 = (2x + 5y)(2x - 5y).
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ax2 - bx2 + ay2 - by2 + az2 - bz2.
x - 1 - (x - 1)2 + ax - a.
9x2 - 1
150 - 6a2