Răspuns:
Explicație pas cu pas:
(x+15)²=16=4²
x+15=4.........x=-11
X+15= -4.....x=-19
(x-12)²=25=5²
x-12=5....x=17
x-12=-5...x=7
(4x+1)²=9=3²
4x+1=3...4x=2...x=1/2
4x+1=-3....4x=-4...x=-1
(3-5x)²=4=2²
3-5x=2............1=5x.....5x=1....x=...
3-5x=-2.....5=5x....5x=5.......x=....
ca idee ecuatia x²=a²>0 are solutiile ±a
