1) x²=5²=5×5=25
2) x²=64²=64×64=4096
3) x²=25²=25×25=625
4) x²=24×24=576
5) x²=(1/4)²=1/16
6) x²=(4/9)²=16/81
7) x²=(3/4)²=9/16
8) x²=(2,25)²=5,0625
Explicație:
9) (x+2)²=36
x²+2×x×2+2²=x²+4x+4
x²+4x+4=36
