Question

решите уравнение (х-4)*(х+4)=7

Answer 1

x^2 - 16 = 7 
x^2 = 16 + 7 
x^2 = 23
x = ± √23

Answer 2

х^2-16=7
x^2=7+16
x^2=23
x=корень из 23