factorise 4a square +12ab+9b square–25x square
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4a^2 + 12ab + 9b^2 -25x^2
=> (2a)^2 + 2(2a)(3b) + (3b)^2 - (5x)^2
=> ( 2a + 3b )^2 - (5x)^2
=> ( 2a + 3a + 5x ) ( 2a + 3b -5x)
=> (2a)^2 + 2(2a)(3b) + (3b)^2 - (5x)^2
=> ( 2a + 3b )^2 - (5x)^2
=> ( 2a + 3a + 5x ) ( 2a + 3b -5x)
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