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Put in the prepositions and write the sentences

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NShmak
NShmak
4,5(30 оценок)
Положить в предлоги и запишите предложения
martynova93
martynova93
4,4(18 оценок)

1)

21y² - 2y - 3 = 0

d = (-2)² - 4 * 21 * (-3) = 256

√(256) = 16

x₁,₂ = (2 ± 16)/(2 * 21) = (2 ± 16)/42

x₁ = (2 - 16)/42 = -1/3

x₂ = (2 + 16)/42 = 3/7

ответ: x₁ = -1/3; x₂ = 3/7

2)

x² + 8x - 13 = 0

d = 8² - 4 * 1 * (-13) = 116

√(116) = 2√(29)

x₁,₂ = (-8 ± 2√(29))/2 = (2(-4 ± √(/2 = -4 ± √(29)

ответ: -4 ± √(29)

3)

9x² + 24x + 49 = 0

d = 24² - 4 * 9 * 49 = -1188

ответ: решений нет среди множества действительных чисел.

KsyLisa
KsyLisa
4,8(93 оценок)

Do you have to get up early at weekends?

Do you have to practice a musical instrument?

Do you have to look after your younger brother or sister?

Do you have to study at the weekend?

Do you have to wash your parents' car?

Do you have to cook dinner?

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