Алгебра: Решите всё задание №4 30 , б заранее спс

Решите всё задание №4 30 , б заранее спс

Ответ:

urspacce

24.08.2020 23:56

Объяснение:

$( - x - 5)(2x + 4) = 0 \\ - x - 5 = 0 \\ - x = 5 \\ x = - 5 \\ 2x + 4 = 0 \\ 2x = - 4 \\ x = - 2$

$(6x - 3)( - x + 3) = 0 \\ 6x - 3 = 0 \\ 6x = 3 \\ x = \frac{1}{2} \\ - x + 3 = 0 \\ - x = - 3 \\ x = 3$

$( - x - 4)(3x + 3) = 0 \\ - x - 4 = 0 \\ - x = 4 \\ x = - 4 \\ 3x + 3 = 0 \\ 3x = - 3 \\ x = - 1$

$(5x + 2)( - x - 6) = 0 \\ 5x + 2 = 0 \\ 5x = - 2 \\ x = - \frac{2}{5} = - 0.4 \\ - x - 6 = 0 \\ - x = 6 \\ x = - 6$

$( - x + 7)(x - 2) = 0 \\ - x + 7 = 0 \\ - x = - 7 \\ x = 7 \\ x - 2 = 0 \\ x = 2$

$(x + 10)( - x - 8) = 0 \\ x + 10 = 0 \\ x = - 10 \\ - x - 8 = 0 \\ - x = 8 \\ x = - 8$

${x}^{2} - 36 = 0 \\ {x}^{2} = 36 \\ x1 = 6 \\ x2 = - 6$

${x}^{2} - 25 = 0 \\ {x}^{2} = 25 \\ x1 = 5 \\ x2 = - 5$

${x}^{2} - 49 = 0 \\ {x}^{2} = 49 \\ x1 = 7 \\ x2 = - 7$

${x}^{2} - 121 = 0 \\ {x}^{2} = 121 \\ x1 = 11 \\ x2 = - 11$

${x}^{2} - 4 = 0 \\{x}^{2} = 4 \\ x1 = 2 \\ x2 = - 2$

${x}^{2} - 100 = 0 \\ {x}^{2} = 100 \\ x1 = 10 \\ x2 = - 10$

$3 {x}^{2} - 9x = 0 \\ x(3x - 9) = 0 \\ x = 0 \\ 3x - 9 = 0 \\ 3x = 9 \\ x = 3$

$5 {x}^{2} - 10x = 0 \\ x(5x - 10) = 0 \\ x = 0 \\ 5x - 10 = 0 \\ 5x = 10 \\ x = 2$

$7 {x}^{2} - 7x = 0 \\ x(7x - 7) = 0 \\ x = 0 \\ 7x - 7 = 0 \\ 7x = 7 \\ x = 1$

$4 {x}^{2} - 16x = 0 \\ x(4x - 16) = 0 \\ x = 0 \\ 4x - 16 = 0 \\ 4x = 16 \\ x = 4$

$7 {x}^{2} - 14x = 0 \\ x(7x - 14) = 0 \\ x = 0 \\ 7x - 14 = 0 \\ 7x = 14 \\ x = 2$

$4 {x}^{2} - 20x = 0 \\ x(4x - 20) = 0 \\ x = 0 \\ 4x - 20 = 0 \\ 4x = 20 \\ x = 5$

$9 {x}^{2} = 54x \\ 9 {x}^{2} - 54x = 0 \\ x(9x - 54) = 0 \\ x = 0 \\ 9x - 54 = 0 \\ 9x = 54 \\ x = 6$

$2 {x}^{2} = 8x \\ 2 {x}^{2} - 8x = 0 \\ x(2x - 8) = 0 \\ x = 0 \\ 2x - 8 = 0 \\ 2x = 8 \\ x = 4$

$3 {x}^{2} = 27x \\ 3 {x}^{2} - 27x =0 \\ x(3x - 27) = 0 \\ x = 0 \\ 3x - 27 = 0 \\ 3x = 27 \\ x = 9$

$4 {x}^{2} = 20x \\ 4 {x}^{2} - 20x = 0 \\ x(4x - 20) = 0 \\ x = 0 \\ 4x - 20 = 0 \\ 4x = 20 \\ x = 5$

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Ответ:

Andrey500500500

24.08.2020 23:56

Записывайте как Вам удобно при решении уравнений, главное видеть, что все они раскладываются на два множителя, причём множители могут быть как в скобках, так и просто х с аргументом.

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