Learnerviz
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Factoring by grouping;

Factor 4(a+b)²-9

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Kaiusviz
[2(a + b) - 3][2(a + b) + 3]
Riza1viz
[tex]4(a+b)^2-9 =[2(a+b)]^2-3 ^{2} = [2(a+b)-3]\cdot [2(a+b)-3]=\\ \\=(2x+2b-3)(2x+2b+3)[/tex]