Answer:
d) x=4
Step-by-step explanation:
[tex]\sqrt{x} +5 = \sqrt{x + 45}[/tex]
[tex](\sqrt{x} +5)^{2} = (\sqrt{x + 45})^{2}[/tex]
[tex]x + 10\sqrt{x} +25 = x + 45[/tex]
[tex]10\sqrt{x} = 20[/tex]
divide 10 in both sides
[tex](\sqrt{x}){2} = (2){2}[/tex]
x=4