Задание 2, стр 47

Представьте уравнения в виде ax2 + bx + c = 0.
1) (x 2)(x + 1) = (2x 5)2 + 1
2) 2(x + 5)(x 8) = 0
3) (x + 3)2 + 3(2x + 1)2 54 = 0
4) (2x 1)2 = (x 1)(x + 7)
5) 4(x 1)2 + 9 = 0
6) (3x 2)2 15(2x 2)2 + 12 = 0

Answers

1.
(x 2)(x + 1) = (2x 5)2 + 1
x2 2x + x 2 = 4x2 20x + 25 + 1
x2 x 2 = 4x2 20x + 26
3x2 + 19x 28 = 0
2.
2(x + 5)(x 8) = 0
2 (x2 + 5x 8x 40) = 0
x2 + 5x 8x 40 = 0
x2 3x 40 = 0.
3.
(x + 3)2 + 3(2x + 1)2 54 = 0
x2 + 6x + 9 + 3 (4x2 + 4x + 1) 54 = 0.
x2 + 6x + 9 + 12x2 + 22x + 3 54 = 0
13x2 + 18x 42 = 0
4.
(2x 1)2 = (x 1)(x + 7)
4x2 4x + 1 = x2 x + 7x 7 4x2 4x + 1 = x2 + 6x 7 3x2 10x + 8 = 0 4(x 1)2 + 9 = 0
5.
4 (x2 2x + 1) 9 = 0 4x2 8x + 4 + 9 = 0 4x2 8x + 13 = 0
6.
(3x 2)2 15(2x 2)2 + 12 = 0 9x2 22x + 4 15 (4x2 8x + 4) + 12 = 0 9x2 12x + 4 60x2 + 120x 60 + 12 = 0 51x2 + 108x 44 = 0
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2022-10-31 13:01
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