Question

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Answer 1

Ответ:

Объяснение:

1.

а) (2x + c)^2 = 4x^2 + 4xc + c^2

б) (6 + x)^2 = 36 + 12x + x^2

в) (a + 5b)^2 = a^2 + 10ab + 25b^2

г) (7x - 2)^2 = 49x^2 - 28x + 4

д) (9c - x)^2 = 81c^2 - 18c + x^2

е) 88^2 = 7744

2.

a) (7x - 2)^2 + 28x = 49x^2 - 28x + 4 + 28x = 49x^2 + 4

б) 32y - 2(1 + 8y)^2 = 32y - 2(1 + 16y + 64y^2) = 32y - 2 - 32y - 128y^2 = -2 - 128y^2

3.

(a + 2b)^2 - 4b(a-b) = a^2 + 4ab + 4b^2 - 4ab + 4b^2 = a^2 + 8b^2 = (4/9) + 8 * (4/9) = 9 * (4/9)