Question

plzzzzzzzzzzzzzzz.....​

Answer 1

Răspuns:

${x}^{2} + 6x + 7 = {x}^{2} + 6x + 9 - 2 = \\ = {x}^{2} + 2 \times x \times 3 + {3}^{2} - 2 = {(x + 3})^{2} - 2$