Question

Radical din 2m este egal cu 4

Answer 1

√2m = 4  C. E. : 2m>= 0 => m>= 0 Ridicam la patrat ambele parti 2m = 16 m = 16:2 m = 8 verifica conditia

Answer 2

$\sqrt{2m} = 4 \\ \\ ( \sqrt{2m}) ^{2} = {4}^{2} \\ \\ \sqrt{(2m) ^{2} } = ( {2}^{2}) ^{2} \\ \\ \sqrt{ {2}^{2} \times {m}^{2} } = {2}^{2 \times 2} \\ \\ {2}^{ \frac{2}{2} } \times {m}^{ \frac{2}{2} } = {2}^{4} \\ \\ 2m = 16 \\ \\ \frac{2m}{2} = \frac{16}{2} \\ \\ m = \frac{ {2}^{4} }{2} = 2 ^{4 - 1} = {2}^{3} = 8$