Question

доможіть будь ласка!

Answer 1

1.

1)

${(c - 6)}^{2} = {c}^{2} - 12c + 36$

2)

${(2a - 3b)}^{2} = {4a}^{2} - 12ab + {9b}^{2}$

3)

$(5 - a)(5 + a) = 25 - {a}^{2}$

4)

$(7x + 10y)(10y - 7x) = {100y}^{2} - {49x}^{2}$

2.

1)

${b}^{2} - 49 = (b - 7)(b + 7)$

2)

${c}^{2} - 8c + 16 = {(c - 4)}^{2}$

3)

$100 - 9 {x}^{2} = (10 - 3x)(10 + 3x)$

4)

${4a}^{2} + 20ab + 25b {}^{2} = {(2a + 5b)}^{2}$