РЕШЕНИЕ:

y=4−x²
y=−3 x

4−x² =− 3x

−x² + 3x + 4 = 0

x² –  3x – 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

РЕШЕНИЕ:

y=6−x²
y= 5x

6−x² =  5x

−x² –  5x + 6 = 0

x² +  5x – 6 = 0

D = 25 – 4∙1∙( – 6) = 25 + 24 = 49 = 7²

x₁ = ( – 5 + 7) / 2 = 2/2 = 1

x₂ = ( – 5 – 7) / 2 = – 12/2 = – 6

Ответ: –6

РЕШЕНИЕ:

y=5−x²
y= 4x

5−x² =  4x

−x² –  4x + 5 = 0

x² +  4x – 5 = 0

D = 16 – 4∙1∙( – 5) = 16 + 20 = 36 = 6²

x₁ = ( – 4 + 6) / 2 = 2/2 = 1

x₂ = ( – 4 – 6) / 2 = – 10/2 = – 5

Ответ: 1

РЕШЕНИЕ:

y=3−x²
y= 2x

3−x² =  2x

−x² –  2x + 3 = 0

x² +  2x – 3 = 0

D = 4 – 4∙1∙( – 3) = 4 + 12 = 16 = 4²

x₁ = ( – 2 + 4) / 2 = 2/2 = 1

x₂ = ( – 2 – 4) / 2 = – 6/2 = – 3

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 = 4/2 = 2

x₂ = (1 – 3) / 2 = – 2/2 = – 1

Ответ: –1