f(x − 2) = 64
$(x-<!--\; -\; -->2{)}^2=64$
$(x-<!--\; -\; -->2{)}^2=(\pm 8{)}^2$
x − 2 = 8
x = 8 + 2
x = 10
или
x − 2 = −8
x = −8 + 2
x = −6
Ответ: x = −6 и x = 10

f(2x) = 49
$(2x{)}^2=49$
$(2x{)}^2=(\pm 7{)}^2$
2x = 7
x = 3,5
или
2x = −7
x = −3,5
Ответ: x = −3,5 и x = 3,5

f(x + 1) = 81
$(x+1{)}^2=81$
$(x+1{)}^2=(\pm 9{)}^2$
x + 1 = 9
x = 9 − 1
x = 8
или
x + 1 = −9
x = −9 − 1
x = −10
Ответ: x = −10 и x = 8

f(−3x) = 121
$(-<!--\; -\; -->3x{)}^2=121$
$(-<!--\; -\; -->3x{)}^2=(\pm 11{)}^2$
3x = 11
$x=\frac{11}{3}=3\frac{2}{3}$
или
3x = −11
$x=-<!--\; -\; -->\frac{11}{3}=-<!--\; -\; -->3\frac{2}{3}$
Ответ: $x=-<!--\; -\; -->3\frac{2}{3}$ и $x=3\frac{2}{3}$