1)4х²-2х-5=0
D=4 +80 = 84
√D=√84
x1= (2+√84)/8
x2=(2-√84)/8
2)7x²-4х-3=0
D= 16+84= 100
√D=10
x1=4+10/14 = 1
x2= 4-10/14=-3/7
3)(2х+5)(х+2)=21
2x²+9x-11=0
D= 81+88 = 169
√D = 13
x1= (-9-13)/4= -5,5
x2=-9+13/4 = 1
4)(4х-3)²+(2х-1)(2х+1)=24
4x²-24x + 9 + 4x²-25= 0
8x²-24x-16= 0
x²-3x-2= 0
D=9+8= 17
√D=√17
x1= (3+√17)/2
x2= (3-√17)/2
1)4х²-2х-5=0
D=4 +80 = 84
√D=√84
x1= (2+√84)/8
x2=(2-√84)/8
2)7x²-4х-3=0
D= 16+84= 100
√D=10
x1=4+10/14 = 1
x2= 4-10/14=-3/7
3)(2х+5)(х+2)=21
2x²+9x-11=0
D= 81+88 = 169
√D = 13
x1= (-9-13)/4= -5,5
x2=-9+13/4 = 1
4)(4х-3)²+(2х-1)(2х+1)=24
4x²-24x + 9 + 4x²-25= 0
8x²-24x-16= 0
x²-3x-2= 0
D=9+8= 17
√D=√17
x1= (3+√17)/2
x2= (3-√17)/2