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vladsherbina1
@vladsherbina1
August 2021
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Помогите!!!
Часть В2 Через дискриминант.
Дам 100Баллов
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m11m
Verified answer
B2.
2²ˣ -3*2ˣ -4=0
t=2ˣ
t² -3t-4=0
D=(-3)² -4*(-4)=9+16=25
t₁=(3-5)/2= -2/2= -1
t₂=(3+5)/2=8/2=4
При t= -1
2ˣ= -1
нет решений
При t=4
2ˣ=4
x=2
Ответ: 2.
7²ˣ⁺⁵ ≥49
7²ˣ⁺⁵ ≥7²
2x+5≥2
2x≥2-5
2x≥ -3
x≥ -1.5
x∈[-1.5; +∞)
Ответ: а)
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Verified answer
B2.2²ˣ -3*2ˣ -4=0
t=2ˣ
t² -3t-4=0
D=(-3)² -4*(-4)=9+16=25
t₁=(3-5)/2= -2/2= -1
t₂=(3+5)/2=8/2=4
При t= -1
2ˣ= -1
нет решений
При t=4
2ˣ=4
x=2
Ответ: 2.
7²ˣ⁺⁵ ≥49
7²ˣ⁺⁵ ≥7²
2x+5≥2
2x≥2-5
2x≥ -3
x≥ -1.5
x∈[-1.5; +∞)
Ответ: а)