Factorise: 81a² + 72ab + 16b².
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(9a + 4b ) ^2
(a+b)^2
a^2 + 2ab + b^2
(9a)^2 + 2*9a*4b + (4b)^2
81a^2 + 2*9a*4b + 16b^2
(9a+4b)^2. factorisation
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