Răspuns :
Răspuns:
31²=31·31=961
31·29=899
31·
29
------
279
62
-------
899
________
(2+√2)²=4+4√2+2=6+4√2
__________
(a+2)²+(a-3)²=a²+4a+4+a²-6a+9=2a²-2a+13
2a²-2a+13=0
Δ=b²-4ac=4-4·2·13=-100
a₁=(2+10i)/4=(1+5i)/2
a₂=(2-10i)/4=(1-5i)/2
Răspuns:
31²=31·31=961
31·29=899
31·
29
------
279
62
-------
899
________
(2+√2)²=4+4√2+2=6+4√2
__________
(a+2)²+(a-3)²=a²+4a+4+a²-6a+9=2a²-2a+13
2a²-2a+13=0
Δ=b²-4ac=4-4·2·13=-100
a₁=(2+10i)/4=(1+5i)/2
a₂=(2-10i)/4=(1-5i)/2