Calculate the sum of the expression
2^x+2^x+2^x+2^x=

✓
2^{x+2}

×
2^{2x}

×
2^{4x}

×
2^{2x+2}

×
2^{8x}
Calculate the sum of the expression
2^x+2^x+2^x+2^x=
2^{x+2}
2^{2x}
2^{4x}
2^{2x+2}
2^{8x}
The sum of the four identical quantities is 4 times of one of those quantities, so the sum of the four terms 2^x is 4 times 2^x
4×2^x = 2^2 × 2^x=2^{x+2}