1.

Expand the following.(5A + 6b)^2.​

Answer»

{(5a + 6b)}^{2}  \\   \\  =  {5a}^{2}  + 2(5a)(6b) +  {6b}^{2}  \\  =  {5a}^{2}  + 2 \times 30ab + {6b}^{2} \\  =  {5a}^{2}  + 60ab + {6b}^{2}   \\  \\  \\

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