Answer:
1. Except B
2. C
3. A
4. C
5. A
Step-by-step explanation:
1. x^2-5-x^2-2x-5=0
x^2 - x^2 = 0
2. Factoring, completing the square or quadratic formula
3. x^2+10x+20+5=0
x^2+10x+25 = (x+5)(x+5)
x = -5 (A)
4. (x+2)^2 =2(x+6)
x^2 +4x +4 = 2x + 12
x^2+4x+4-2x-12=0
x2+2x-8=0
(x-2)(x+4)
x + 4 = 0. x = -4. (C)
5. (x+8)(x+5)=x+4
x^2+5x+8x+40-x-4=0
x^2+12x+36=0
(x+6)^2 = 0
(x+6)(x+6)
x = -6. (A)
