Question

(2x+5y+3) (2x+5y+4) find the product of the following (using standard results):

Answer 1

$(2x + 5y + 3)(2x + 5y + 4) \\ = 4 {x}^{2} + 10xy + 8x + 10xy + 25 {y}^{2} +20 y+ 6x + 15y + 12 \\ = 4 {x}^{2} + 20xy + 14x + 25 {y}^{2} + 35 y + 12 \\ =4 {x}^{2} + {25y}^{2} + 20xy + 14x + 35y + 12$
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