Question

$\frac{1}{9} x^{2} = 16$

Answer 1

x*x=16*9 (inviersul lui 1/9)
x*x=144
x1=-12
x2=12

Answer 2

vine 16*9=x la a 2-a
x la a-2a=144
x=radical din 144
=>x=12