X^2 - 14x + 49 + 3 = x^2 - 4
x^2 - 14x + 52 = x^2 - 4
x^2 - 14x + 52 - x^2 + 4 = 0
- 14x + 56 = 0
- 14x = - 56
14x = 56
x = 4
1) 10у-5х+3у+9у=22у-5х
2)4а-(7а-5)=4а-7а+5=5-3а
3)7а-b+(2b-9a)= 7a-b+2b-9a=b-2a
4)13-5(p-4)=13-5p+20=33-5p
2) у²+6у=0
у*(у+6)=0
у1=0
у+6=0
у2=-6
4)х²+2,5х=0
х(х+2,5)=0
х1=0
х+2,5=0
х=-2,5
6) 6х²-0,5х=0
х(6х-0,5)=0
х1=0
6х-0,5=0
6х=0,5
х2=0,5:6=5/10:6=5/60=1/12
8) 1/4х²+х=0
х(1/4х+1)=0
х1=0
1/4х+1=0
1/4х=-1
х2=-1:1/4=-1*4=-4