Hitunglah nilai x Tolong yahh

5x^2-4x^2=12^2
=> 25x^2 - 16x^2 = 144
=> 4x^2 = 144
=> x^2 = 144:4
=> x^2 = 36
=> x = 6
ket. x^2= x kuadrat 

Jawaban ada di foto yaa