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Rezolvati in R urmatoarele ecuatii:
√2x + 7 =41
√5x - 31 =4


Răspuns :

a)√2x+7=41
√2x=41-7
√2x=34
x=34/√2
x=34√2/2
x=17√2
b)√5x-31=4
√5x=4+31
√5x=35
x=35/√5
x=35√5/5
x=7√5
√2x + 7 =41 
√2x=41-7
√2x=34
x=34/√2 (rationalizam)=34√2/2 (simplificam prin 2)
x=17
√2

√5x - 31 =4
√5x=31+4
√5x=35
x=35/√5 (rationalizam)
x=35√5/5 (simplificam prin 5)
x=7√5