1) 4x²-8x+3=0
4x²-8x=-3
x²-2x= - 3/4
x²-2x+?= - 3/4+ ?
x²-2x+1= - 3/4+ ?
x²-2x+1= - 3/4 +1
(x-1)²=1/4
x1= 1/2
x2= 3/2
2)x²-5x-14= 0
x²-5x=14
x²-5x+?= 14+ ?
x²-5x+ 25/4 = -14+ 25/4
(x - 5/2)² = 81/4
x1= -2
x2 = 7
3) x²-10x-24= 0
x²-10x=24
x²-10+25= 24+25
(x-5)²= 49
x1=-2
x=12
4) x²+3x-18=0
x²-3x=18
x²-3x + 9/4 = 18+ 9/4
(x+ 3/2)²= 81/4
x1= -6
x2= 3
5) x²+14x+40=0
x²+14x= -40
x²+ 14 + 49 = -40 + 49
( x+7)²= 9
x1= -10
x2= -4
1) 4x²-8x+3=0
4x²-8x=-3
x²-2x= - 3/4
x²-2x+?= - 3/4+ ?
x²-2x+1= - 3/4+ ?
x²-2x+1= - 3/4 +1
(x-1)²=1/4
x1= 1/2
x2= 3/2
2)x²-5x-14= 0
x²-5x=14
x²-5x+?= 14+ ?
x²-5x+ 25/4 = -14+ 25/4
(x - 5/2)² = 81/4
x1= -2
x2 = 7
3) x²-10x-24= 0
x²-10x=24
x²-10+25= 24+25
(x-5)²= 49
x1=-2
x=12
4) x²+3x-18=0
x²-3x=18
x²-3x + 9/4 = 18+ 9/4
(x+ 3/2)²= 81/4
x1= -6
x2= 3
5) x²+14x+40=0
x²+14x= -40
x²+ 14 + 49 = -40 + 49
( x+7)²= 9
x1= -10
x2= -4