Question

Прошу!!!Помогите!!!!!!!!!!

Answer 1

$49 \times {x }^{2} - 112 \times x \times y + 64 \times {y }^{2} = \\ {(7x)}^{2} - 2 \times 7x \times 8y + {(8y)}^{2} = \\ {(7x - 8y)}^{2} = (7x - 8y)(7x - 8y)$