Answers

2016-07-11T23:37:19+08:00
Square the first and last factors and put the 2nd factor's sign in between thus getting the answer (2a+9b)²
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2016-07-12T00:23:50+08:00

  4a² + 12ab + 9b²
    this is a perfect square trinomial which can be easily factorized into                   a perfect square binomial
     that is    (2a + 3b)²       /   take the sqrt of  4a²  &   9b² and squared them
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This is a factoring trinomial????