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nursina1105
@nursina1105
August 2022
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Очень срочно! 35 баллов даю!
(4x+5)^2+(2-3x)^2=(3+5x)^2
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Dимасuk
Verified answer
(4x + 5)² + (2 - 3x)² = (3 + 5x)²
16x² + 40x + 25 + 4 - 12x + 9x² = 9 + 30x + 25x²
25x² + 28x + 29 = 9 + 30x + 25x²
28x + 20 = 30x
2x = 20
x = 10
Ответ: x = 10.
1 votes
Thanks 2
nursina1105
Откуда 40x, 12x,30x?
Dимасuk
Удвоенное произведение. Формула квадрата суммы и квадрата разности: (a + b)^2 = a^2 + 2ab + b^2 и (a - b)^2 = a^2 - 2ab + b^2
nursina1105
Большое спасибо
Dимасuk
Не за что.
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Answers & Comments
Verified answer
(4x + 5)² + (2 - 3x)² = (3 + 5x)²16x² + 40x + 25 + 4 - 12x + 9x² = 9 + 30x + 25x²
25x² + 28x + 29 = 9 + 30x + 25x²
28x + 20 = 30x
2x = 20
x = 10
Ответ: x = 10.