Answer for question 19:
[tex]\boxed{Answer:~x=-1 ~or~ x=-2}[/tex]
→ Step -1: Factor left side of equation:
[tex](x+1)(x+2)=0[/tex]
→ Step 2: Set factors equal to 0:
[tex]x+1=0 ~or ~x+2=0[/tex]
[tex]x=-1 ~or ~x=-2[/tex]
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Answer for question 20:
[tex]\boxed{Answer:~x=4 ~or ~x=-4}[/tex]
→ Step -1: Add 13 to both sides:
[tex]x^2-13+13=3+13[/tex]
[tex]x^2=16[/tex]
→ Step 2: Take square root:
[tex]x=[/tex] + [tex]\sqrt{16}[/tex]
[tex]x=4 ~or ~x=-4[/tex]
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Answer for question 21:
[tex]\boxed{Answer:~x=2 ~or~ x=-14}[/tex]
→ Step 1: Factor left side of equation:
[tex](x-2)(x+14)=0[/tex]
→ Step 2: Set factors equal to 0:
[tex]x-2=0 ~or~ x+14=0[/tex]
[tex]x=2 ~or~ x=-14[/tex]
