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[tex]( {a + b})^{2} = {a}^{2} + 2ab + {b}^{2} [/tex]
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[tex]4 {x}^{2} + 20x + p = [/tex]
[tex]( {2x})^{2} + 2(2x)(5) + p = [/tex]
Thus ;
[tex]p = {5}^{2} [/tex]
So
[tex]p = 25[/tex]
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