Question

1) |x-5|=1
2) |x-3|<15

3) x+3<25
4) x²-4=0 (ecuatie de gradul 2)

Answer 1

1) |x-5|=1  
x-5= -1 => x= -1 +5 => x= 4
SAU
x-5 = 1 => x= 1+5 => x=6

2) |x-3|<15
x-3 < -15 => x < -15 + 3 => x < -12
SAU
x-3 < 15 => x < 15 + 3 => x < 18

3) x+3<25
x < 25 - 3
x < 22

4) x²-4=0 (nu am facut inca la scoala, dar nu pare sa fie de gradul 2)
x² - 4 = 0 => x² = 0 + 4 => x² = 4 => x =  \sqrt{4} => x = 2