Toán Lớp 7: Nếu √x = 2 thì x2 bằng
A. 2 ; B. 4 ; C. 8 ; D. 16
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Toán Lớp 7: Nếu √x = 2 thì x2 bằng
A. 2 ; B. 4 ; C. 8 ; D. 16
Comments ( 2 )
\sqrt{x} = 2
⇒ x = 4
⇒ x^2 = 16
Vậy x^2 =16
$\longrightarrow$ Chọn D
sqrt{x} = 2
=> x = 2^2
=> x = 4
Có:
x^2 = 4^2
=> x^2 = 16
=> D