1. 1) 1. 2) 0. 3) 2. 4) 2.
2. 1) p(сумма) = 5
q(добуток) = -6
2) p = -3.5
q = 11
3. 1)7x²-28=0;
7x²=28
x= 2
2) 2x²+3x=0
x(2x+3)=0
x=0 або 2x+3=0
2x=-3
x=-1,5
4.1) x²-5x-6=0
D= (-5)²-4×1×(-6)=25+24=49
x1=(5+7)/2=6
x2=(5-7)/2=-1
2) 16x²+8x+1=0
D=64-64=0
x=-8/2=-4
5.1)2x²-8x-10=0
D=64+40=144
x1=8+12/4=5
x2=8-12/4=-1
2x²-8x-10=2(x-5)(x+1)
2)-x²+3x-2=0
D=9-8=1
x1=-3+1/-2=1
x2=-3-1/-2=2
-x²+3x-2=-(x-1)(x-2)
6.x1+x2=-p
x1x2=-16
x1=8
x2=-2
p=-6
7.(x+(x+1))-x×(x+1)=13
x²