The error next to the problem above in the image is (4 + 3). It is an error because the coefficient of the variables are supposed to be multiplied with each other, only the exponents are meant to be added. The correct process is (4 × 3). The correct answer is 12a⁷.
Solving indices.
In mathematics, Indices are numbers and variables that are raised to their exponents. The exponents shows how many times the numbers or the variables are repeatedly multiplied by themselves.
In the attached image, we are to spot out the error in the given indices.
According to the rule of indices, when multiplying two indices together, add the variables exponents attached to each variables. By doing so, we have:
Therefore, the error occurred at (4 + 3), it is supposed to be (4×3).