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5*3la puterea x-2*3la puterea x=81

Răspuns :

5*3^x -2*3^x=81
3*3^x=3^4
3^(x+1)=3^4
x+1=4
x=3
5*3ˣ-2*3ˣ =81
3ˣ *( 5-2)= 3⁴
3ˣ *3 = 3⁴
3ˣ⁺¹ =3⁴
x+1 =4
x=4-1
x=3