Answer:
[tex] \sqrt{7} ^{2} + 2^{2} = {x}^{2} \\7 + 4 = {x}^{2} \\ 11 = {x}^{2} \\ x = \sqrt{11} \\ x = 3.316cm[/tex]
[tex]\sqrt{11}[/tex]
Step-by-step explanation:
[tex]\sqrt{7}^2+2^2=x^2[/tex]
the square roots will cancel
[tex]7+4=x^{2}[/tex]
to get x alone
[tex]\sqrt{11} =\sqrt{x} ^2[/tex]
the square roots will cancel leaving just the square root of 11
