1.
х² - 5х + 4 = 0
Д = (-5)² - 4*1*4 = 25 - 16 = 9,
х1 = (5 + 3) / 2*1 = 4,
х1 = (5 - 3) / 2*1 = 1,
2.
3х - 18 = 0,
3х = 18,
х = 6,
3.
х² + 16 = 0,
х² = -16 ⇒ розв'язків немає
4.
√х²-16 = 0,
(√х²-16)² = 0²,
х² - 16 = 0,
х² = 16,
х1 = 4, х2 = - 4
1 - Г
2 - А
3 -
4 - В
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Answers & Comments
Verified answer
1.
х² - 5х + 4 = 0
Д = (-5)² - 4*1*4 = 25 - 16 = 9,
х1 = (5 + 3) / 2*1 = 4,
х1 = (5 - 3) / 2*1 = 1,
2.
3х - 18 = 0,
3х = 18,
х = 6,
3.
х² + 16 = 0,
х² = -16 ⇒ розв'язків немає
4.
√х²-16 = 0,
(√х²-16)² = 0²,
х² - 16 = 0,
х² = 16,
х1 = 4, х2 = - 4
1 - Г
2 - А
3 -
4 - В