Answer:
Explanation below.
Step-by-step explanation:
1. a. [tex]\sqrt{x} =12[/tex]
b. [tex]\sqrt{x} ^{2}=12^{2}[/tex]
c. x=144
2. a. [tex]\sqrt{x^{2} } =\sqrt{196}[/tex]
b. x= 14
3.
[tex]\sqrt{x} -4 +4= 8+4\\\sqrt{x} =12\\x= 3.46410161514 \\or \\2\sqrt{3}[/tex]
4.
[tex]2(x^{2} +3)=398\\x^{2} +3= 199\\x^{2} =196\\x=14[/tex]
