Ответ:
x^4 = (5x-36)^2
используем a^2 - b^2 = (a-b)(a+b)
x^4 - (5x - 36)^2 = 0
(x^2 - 5x + 36)(x^2 + 5x - 36) = 0
1. x^2-5x+36=0
D=b^2 - 4ac
D = 25 - 4*36 = 25 - 144 = -119 < 0
2. x^2 + 5x - 36 = 0
D=25 + 4*36 = 25 + 144 = 169 = 13^2
x12=(-5+-13)/2 = - 9 4
ответ x={-9, 4}
Объяснение:
4x = (5x - 36)×2
4x = 10x - 72
4x - 10x = -72
-6x = -72
x = 12
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Answers & Comments
Ответ:
x^4 = (5x-36)^2
используем a^2 - b^2 = (a-b)(a+b)
x^4 - (5x - 36)^2 = 0
(x^2 - 5x + 36)(x^2 + 5x - 36) = 0
1. x^2-5x+36=0
D=b^2 - 4ac
D = 25 - 4*36 = 25 - 144 = -119 < 0
2. x^2 + 5x - 36 = 0
D=25 + 4*36 = 25 + 144 = 169 = 13^2
x12=(-5+-13)/2 = - 9 4
ответ x={-9, 4}
Объяснение:
Ответ:
Объяснение:
4x = (5x - 36)×2
4x = 10x - 72
4x - 10x = -72
-6x = -72
x = 12