y=-x²+6x-7 y=2x+a
-x²+6x-7=2x+a
x²-6x+7+2x+a=0
x²-4x+7+a=0
D=4²-4*(7+a)≥0
16-28-4a≥0
-4a≥12 |÷(-4)
a≤-3
Ответ: a∈(-∞;-3].
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y=-x²+6x-7 y=2x+a
-x²+6x-7=2x+a
x²-6x+7+2x+a=0
x²-4x+7+a=0
D=4²-4*(7+a)≥0
16-28-4a≥0
-4a≥12 |÷(-4)
a≤-3
Ответ: a∈(-∞;-3].