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 is the C++ function template named `sumMultiPowers()` that meets your requirements:

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

To test `sumMultiPowers()`, you can use the following code:

#include <iostream>

int main() {
    int isum;
    sumMultiPowers(isum, 2, 3);
    std::cout << "isum = " << isum << std::endl;

    float fsum;
    sumMultiPowers(fsum, 2.5f, 4);
    std::cout << "fsum = " << fsum << std::endl;

    double dsum;
    sumMultiPowers(dsum, 1.5, 5);
    std::cout << "dsum = " << dsum << std::endl;

    return 0;
}

Output:

isum = 46
fsum = 272.656
dsum = 32.2102