1.
(3z+5)²-(4z-7)²=0
9z²+30z+25-(16z²-56z+49)=0
9z²+30z+25-16z²+56z-49=0
-z²+86z-24=0
D=7396-672=6724
√D=82
X1=(-86-82)/2*(-7)=-168/ -14= 12
X2=(-86+82)/2*(-7)=-4/-14=-2/-7= 2/7
2.
(3x+5)²-64=0
(3x+5)² – 8²=0
(3x+5+8)(3x+5-8)=0
3x+5+8=0 , 3x+5-8=0
3x=-13 3x=3
X1=-13/3=-4 1/3 x2=1
1.
(3z+5)²-(4z-7)²=0
9z²+30z+25-(16z²-56z+49)=0
9z²+30z+25-16z²+56z-49=0
-z²+86z-24=0
D=7396-672=6724
√D=82
X1=(-86-82)/2*(-7)=-168/ -14= 12
X2=(-86+82)/2*(-7)=-4/-14=-2/-7= 2/7
2.
(3x+5)²-64=0
(3x+5)² – 8²=0
(3x+5+8)(3x+5-8)=0
3x+5+8=0 , 3x+5-8=0
3x=-13 3x=3
X1=-13/3=-4 1/3 x2=1