diff --git a/calculate.go b/calculate.go
new file mode 100644
index 00000000..877eddf2
--- /dev/null
+++ b/calculate.go
@@ -0,0 +1,28 @@
+package lab4
+
+import (
+	"fmt"
+	"math"
+)
+
+func CalculateY(a, b, x, xk float64) float64 {
+	numerator := math.Pow(a, 2) - math.Pow(b, 2)
+	denominator := math.Log10(a / b)
+	power := math.Sqrt(a * b)
+
+	y := numerator / denominator * math.Pow(3, power)
+	determinant := xk - x
+	x2 := x + determinant/4
+	x3 := x + determinant/2
+	x4 := x + (3*determinant)/4
+	x5 := xk
+
+	fmt.Println("y =", y)
+	fmt.Println("x =", x)
+	fmt.Println("x2 =", x2)
+	fmt.Println("x3 =", x3)
+	fmt.Println("x4 =", x4)
+	fmt.Println("x5 =", x5)
+
+	return y
+}
diff --git a/golang/internal/sample.go b/golang/internal/sample.go
index c4b72b52..8af0e7f8 100644
--- a/golang/internal/sample.go
+++ b/golang/internal/sample.go
@@ -1,5 +1,5 @@
-package internal
-
-func Summ(a, b int) int {
-	return a + b
-}
+package internal
+
+func Summ(a, b int) int {
+	return a + b
+}