Question

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Answer 1

Answer:

4)

d) -1,-1

Step-by-step explanation:

x^2+2x+1=0

x^2+x+x+1 = 0

x(x+1)+1(x+1) =0

(x+1)(x+1)=0

x = -1,-1

Answer 2

Answer:

3. b

4. d

5. b

Step-by-step explanation:

for 3rd

it is a property of systems

for 4th

x^2 + 2x + 1 = 0

x^2 + x + x + 1 = 0

x(x + 1) + 1( x+1 ) =0

(x + 1)(x + 1)=0

x = -1,-1

for 5th

it is a formula