(x-1)^2 = 4 (x+1)^2=25
(x-1)^3=27 (x+1)^3=64
(x-1)^2 = 4 (x+1)^2=25 (x-1)^3=27 (x+1)^3=64
By Kaylee
By Kaylee
(x-1)^2 = 4 (x+1)^2=25
(x-1)^3=27 (x+1)^3=64
a) (x-1)2=4
=> (x-1)2 = 22
=> X-1 = 2
=> X = 3
b) (x+1)2=25
=> (x+1)2 = 52
=> X+1 = 5
=> X = 4
c) (x-1)3=27
=> (x-1)3 = 33
=> X-1 = 3
=> X = 4
d) (x+1)3=64
=> (x+1)3 = 43
=> X+1 = 4
=> X = 3
Đáp án:
`(x-1)^2 = 4`
`(x-1)^2 = 2^2`
`⇒ x – 1 = 2`
` x = 2 + 1 `
` x = 3 `
`(x+1)^2=25`
` (x+1)^2=5^2`
`⇒ x + 1 = 5`
` x = 5 – 1 `
` x = 4 `
`(x-1)^3=27`
`(x-1)^3=3^3`
`⇒ x – 1 = 3`
`x = 3 + 1`
` x = 4 `
`(x+1)^3=64`
`(x+1)^3=4^3`
` ⇒ x + 1 = 4 `
` x = 4 – 1 `
` x = 3 `
` =( `
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