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X la puterea a 2 a + 3 la puterea a 4 a =15 la a2a

Răspuns :


[tex] x^{2} [/tex]+ 81=225
[tex] x^{2} [/tex] = 225-81
[tex] x^{2} [/tex] = 144
x = [tex] \sqrt{144} [/tex]
x = 12

x^2+3^4=15^2
x^2+81=225
x^2=144
12^2=144=>x=12
^= la puterea