Question

How do you solve 19-21?

Answer 1

Answers for the following question:

Question 19: x = -1 or x = -2

Question 20: x = 4 or x = -4

Question 21: x = 2 or x = -14

Explanation:

For question 19:

= (x+1)(x+2)=0

= x+1=0 or x+2 =0

x = -1 or x = -2

For question 20:

x² - 13 + 13 = 3 + 13

x² = 16

x =
`√(16)`

x = 4 or x = -4

For question 21:

(x-2) (x+14) = 0

x - 2 = 0 or x +14 = 0

x = 2 or x = -14

Answer 2

Answer for question 19:

`\boxed{Answer:~x=-1 ~or~ x=-2}`

→ Step -1: Factor left side of equation:

`(x+1)(x+2)=0`

→ Step 2: Set factors equal to 0:

`x+1=0 ~or ~x+2=0`

`x=-1 ~or ~x=-2`

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Answer for question 20:

`\boxed{Answer:~x=4 ~or ~x=-4}`

→ Step -1: Add 13 to both sides:

`x^2-13+13=3+13`

`x^2=16`

→ Step 2: Take square root:

`x=` +
`√(16)`

`x=4 ~or ~x=-4`

______________________________________________________

Answer for question 21:

`\boxed{Answer:~x=2 ~or~ x=-14}`

→ Step 1: Factor left side of equation:

`(x-2)(x+14)=0`

→ Step 2: Set factors equal to 0:

`x-2=0 ~or~ x+14=0`

`x=2 ~or~ x=-14`