1. 1/2
2. 1
3. √2
4. 2
1
1. 3
2. -3
3. 6
4. -6
-6
1. a=-b
2. b=-c
3. c=-a
4. b=a+c
b=-c
1. 2x2+3x+18=0
2. x2+6x-9=0
3. x2+6x+9=0
4. x2-6x+9=0
x2+6x+9=0
1. n(n-1)
2. n(n+1)
3. n2
4. (n+1)2
n2
1. (n-1)/n
2. n/(n+1)
3. (n+1)/(n+2)
4. (n+1)/n
n/(n+1)
1. 0
2. A2 + B2
3. A2 + 2AB+ B2
4. A + B
A2 + B2
1. 5
2. 25
3. -5
4. -25
25
1. dm
2. dm-1
3. dm-2
4. d
dm-1
1. a + b + c
2. 0
3. ac
4. ad + bc
ac