factorise 9(b+2a)^2-4a^2
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9(b+2a)²-4a²
=>9(b²+4ab+4a²) - 4a²
=>9b²+ 36ab + 36a²-4a²
=>9b²+36ab +32a²
=>9b²+ 12ab + 24ab + 32a² (splitting 36ab)
=>3b(3b + 4a) + 8a(3b + 4a)
=>(8a + 3b) (3b + 4a)
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