Question

buenas noches me ayudan por favor

59abfeb81bf486ea33b9a830fc6bd5fa.docx

Answer 1

Explicación paso a paso:

$(7x + 2) ^{2} = ax {}^{2} + bx + c \\ (7x + 2) {}^{2} = 49x {}^{2} + 28x + 4 \\ a = 49 \\ b = 28 \\ c = 4 \\ a + b + c = 81$