РЕШЕНИЕ:

y=3−x²
y=−2 x

3−x² =− 2x

−x² + 2x + 3 = 0

x² –  2x – 3 = 0

D = 4 – 4∙1∙( – 3) = 4 + 12 = 16 = 4²

x₁ = (2 + 4) / 2 = 6/2 = 3

x₂ = (2 – 4) / 2 = – 2/2 = – 1

Ответ: 3

РЕШЕНИЕ:

y=2−x²
y= x

2−x² =  x

−x² –  x + 2 = 0

x² +  x – 2 = 0

D = 1 – 4∙1∙( – 2) = 1 + 8 = 9 = 3²

x₁ = ( – 1 + 3) / 2 = 2/2 = 1

x₂ = ( – 1 – 3) / 2 = – 4/2 = – 2

Ответ: –2

РЕШЕНИЕ:

y=4−x²
y=− 3x

4−x² =−3 x

−x² + 3x + 4 = 0

x² – 3 x – 4 = 0

D = 9 – 4∙1∙( – 4) = 9 + 16 = 25 = 5²

x₁ = (3 + 5) / 2 = 8/2 = 4

x₂ = (3 – 5) / 2 = – 2/2 = – 1

Ответ: 4

РЕШЕНИЕ:

y=6−x²
y=− x

6−x² =− x

−x² + x + 6 = 0

x² –  x – 6 = 0

D = 1 – 4∙1∙( – 6) = 1 + 24 = 25 = 5²

x₁ = (1 + 5) / 2 = 6/2 = 3

x₂ = (1 – 5) / 2 = – 4/2 = – 2

Ответ: 3