Question

1) x³ =-27

2)x²+1=26

3)(x+2)²=49

4)(3x+1)³=64

Answer 1

`x^3 = 27`

`=> x^3 = 3^3`

`=> x = 3`

Vậy ...

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`x^2 + 1 = 26`

`=> x^2 = 26 - 1`

`=> x^2 = 25`

`=> x^2 = 5^2`

`=> x = -5` hoặc `x = 5`

Vậy ...

Answer 2

`(x+2)^2 = 49`

`=> (x+2)^2 = 7^2`

`=> x + 2 = -7` hoặc `x + 2 = 7`

`=> x = -9` hoặc `x=5`

Vậy ...

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`(3x + 1)^3 = 64`

`=> (3x + 1)^3 = 4^3`

`=> 3x + 1 = 4`

`=> 3x = 3`

`=> x = 1`

Vậy ...