Explicație pas cu pas:
a)
[tex]\sqrt[3]{16} = \sqrt[3]{ {2}^{4} } = \sqrt[3]{ {2}^{3} \cdot 2} = 2 \sqrt[3]{2} [/tex]
b)
x < 0 => |x| = -x
[tex]\sqrt{49 {x}^{2}y } = \sqrt{ {7}^{2} {x}^{2}y } = 7 |x|y = - 7xy \\ [/tex]
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Explicație pas cu pas:
a)
[tex]\sqrt[3]{16} = \sqrt[3]{ {2}^{4} } = \sqrt[3]{ {2}^{3} \cdot 2} = 2 \sqrt[3]{2} [/tex]
b)
x < 0 => |x| = -x
[tex]\sqrt{49 {x}^{2}y } = \sqrt{ {7}^{2} {x}^{2}y } = 7 |x|y = - 7xy \\ [/tex]