Question

ayudenme con los siguientes ejercicios

Answer 1

 x= 2       y = -1    z= -2      a = 1/2     b = -1/4

Serie 1
1. 2xy - 3ab + 1
2(2)(-1) -3 (1/2)(-1/4)
-4 + 3/8 =  - 29/8

2. x^2 - y^2 - z
(2)^2 - (-1)^2 -(-2)
4 -1 + 2 = 5

3. z^2 - 2z + 3
(-2)^2 - 2(-2) + 3
4 + 4 + 3 = 11

4. (x + y)(x - y)
(2 + (-1))( 2 - (-1))
(2 -1)(2 +1)
  1 x 3 = 3

5. a^2 - b^2 + 2ab
(1/2)^2 - (-1/4)^2 + 2(1/2)(-1/4)
1/4 - 1/16 -1/4 =  -1/162

Serie 2

1. ( x + 7)(x +3)
x^2 + 3x +7x + 21
x^2 + 10x + 21

2. (2x + 7)(x +1)
2x^2 + 2x + 7x + 7
2x^2 9x + 7

3. (y +5)(y - 4)
y^2 -4y +5y - 20
y^2 + y - 20

4. (x + 2a)(x -2a)
x^2 -2ax + 2ax + 4a^2
x^2 + 4a^2

5. (4x -9)(3x + 3)
12x^2 +12x + 27x + 27
12x^2 + 39x + 27

3 Serie

1. (x -9)(x +12)
x^2 +12x - 9x - 108
x^2 + 3x - 108

2. (y + 5)( y - 7)
y^2 - 7y + 5y  -35
y^2 -2y -35

3. (a + 9)(a - 9)
a^2 -9a + 9a - 81
a^2 -81

4. (5b + 1)(b -1)
5b^2 -5b +1b - 1
5b^2 -4b -1

5. (7y + 4)^2
(7y + 4)( 7y + 4)
49y^2 + 28y + 28y + 16
49y ^2 56y + 16

6. (4a - 3b)( a + b)
4a^2 + 4ab -3ab - 3b^2
4a^2 + ab - 3b^2

7. (2x + 3y)(2x - 3y)
4x^2 -6xy +6xy - 9y
4x^2 -9y

8. (2b - 3)(b + 3)
2b^2 + 6b - 3b - 9
2b^2 3b - 9

9. (y - 7)^2
(y - 7)( y - 7)
y^2  -7y - 7y + 49
y^2 - 49y + 49

10. (x - 13)(x + 12)
x^2+ 12x - 13x -156
x^2 -x - 156