Answer:
x = 9
Step-by-step explanation:
12^2+x^2 = 15^2
==> x = 9
9
x = [tex]\sqrt{c^{2} - a^{2} }[/tex]
x = [tex]\sqrt{15^{2} - 12^{2} }[/tex]
x = [tex]\sqrt{225 - 144}[/tex]
x = [tex]\sqrt{81}[/tex]
