Question

rezolvati in multimea numerelor reale ecuatiile:
ex: 1/81 a) x²=4
b)x²=9
c)x²=144
f)x²=16 supra 25

Answer 1

* a) x² = 4 
x = √4 = 2 

b) x² = 9 
x = √9 = 3

c) x² = 144 
x = √144 = 12

d) $x^{2}= \frac{16}{25} \\ \\ x= \sqrt \frac{16}{25} = \frac{\sqrt{16} }{\sqrt{25} } = \frac{4}{5}$

/robertinni