a.) x2-4x+3 = -2x+2 | 2x-2
x2-2x+1 = 0 ------>pq-Formel
x1,2= 1 ±√ (1-1)
x1,2= 1
--->S (1;0)
b) x2-4x+7 = x2-10x+25
-4x+7 = -10x+25| -7
-4x = -10x+18 +10x
6x= 18
x=3
S(3:4)
c.) x2-3x-4 = -x2+8x-16
x2-3x-4 = -x2+8x-16 |-x^2
-3x-4 = -2x2+8x-16 | +3x +4
0= -2x2+11x-12 | :(-2)
0= x2-(11/2 )x +6 ->PQ-Formel
x1.2= 11/4 ±√121/16 -96/16)
x1.2= 11/4 ±5/4
x1=4
x2=3/2
S1( 4: 0)
S2 (3/2; -25/4)