Respuesta :

novastar9
At the last step, he should not have multiplied 15 by 4 to get 60. The 4 is in the square root, so he can only multiply the 15 by 2, because 2^2 = 4. Thus, the final answer should not be 60 * sqrt6 but 30 * sqrt6

Answer:

Between step 4 and final answer, the incorrect square root is used as a multiplier

Step-by-step explanation:

Process should be

-5√11 + 15√(6 • 4)

-5√11 + 15√6 • √4

-5√11 + 15√6 • 2

-5√11 + 30√6