Question

помогите пожалуйста
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Answer 1

Ответ:

$(7x + 4a) ^{2} = 49 {x}^{2} + 56xa + 16a ^{2} \\ {(2x - c)}^{2} = 4x ^{2} - 4xc + {c}^{2} \\ (4a + 9b)(9b - 4a) = 81b ^{2} - 16a^{2} \\ (6x - 4) ^{2} = 36x^{2} - 48x + 16 \\ (x + 10) ^{2} = x ^{2} + 20x + 100.$