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(64)²*4^3\4=(2^6)^1\4 * (2²)^3\4 =2^6\4 * 2^6\4 =2³ =8 D
3)
3x+6 \ -5 <2-x
3x+6 <-10+5x
-2x <--16 /÷(-2)
x>8 X∈(8 ;∞) D
4)
3x+y=-3 / * (-1)
2x+y=-1
-3x-y=3
2x+y=-1
-x=2 /÷(-1)
x=-2
Podstawiamy za x;
2x+y=-1
2*(-2)+y=-1
-4+y=-1
y=3
Czyli mamy;
x= -2
y=3 (druga ćwiartka) B
5)
y=-3\4x²-3x+2
xw=-b\2a=3\2*(- 3\4) =3\ -6\4 = -2
x= -2 B
6)
y=x²+ax+b
0=(-4)²+a*(-4)+b
0=2²+2*a+b
0=16-4a+b /÷(-1)
0=4+2a+b
0=-16+4a-b
0=4+2a+b
0=-12+6a
12=6a /÷6
a=2
0=4+2a+b
0=4+2*2+b
-8=b
Czyli mamy;
a=2
b= -8
a+b=-6
2+(-8)=-6
-6=-6 B