Решите уравнения.
Только не через дискриминант.

(x +- y)² = x² +- 2xy + y²

a² - b² = (a - b)(a + b)

28x + 49x² + 4 = 0

(7x + 2)² = 0

7x = -2

x = -2/7

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0.01y² + 10000 - 20y = 0

(0,1y - 100)² = 0

0,1y = 100

y = 1000

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(3x - 5)² - 16 = 0

(3x - 5)² - 4² = 0

(3x - 5 - 4)(3x - 5 + 4) = 0

3x = 9

x₁ = 3

3x = 1

x₂ = 1/3