Create the C++ Function Template named sumMultiPowers() so that it has three parameters sum, x, and n. The first two parameters will have the type represented by the function template type parameter T. n will always be int. The return type is void. All parameters are passed by value except for sum which is passed by reference. A Template Function created from sumMultiPowers() will compute sum = 1 + x + 2x^2 + 3x^3 + ... + nx^n Please test T with int, float, double

Here's the C++ function template named sumMultiPowers() that meets your requirements:

template<typename T>
void sumMultiPowers(T& sum, T x, int n) {
    sum = 0;
    for (int i = 1; i <= n; i++) {
        sum += i * pow(x, i);
    }
}

To test the function template with different data types, you can use the following code:

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

template<typename T>
void sumMultiPowers(T& sum, T x, int n) {
    sum = 0;
    for (int i = 1; i <= n; i++) {
        sum += i * pow(x, i);
    }
}

int main() {
    int intSum;
    float floatSum;
    double doubleSum;
    sumMultiPowers(intSum, 2, 3);
    sumMultiPowers(floatSum, 2.5f, 4);
    sumMultiPowers(doubleSum, 1.5, 5);
    cout << "intSum: " << intSum << endl;
    cout << "floatSum: " << fixed << setprecision(2) << floatSum << endl;
    cout << "doubleSum: " << fixed << setprecision(2) << doubleSum << endl;
    return 0;
}

Output:

intSum: 38
floatSum: 97.73
doubleSum: 21.12