Sadie simplified the expression StartRoot 54 a Superscript 7 b cubed EndRoot, where a greater-than-or-equal-to 0, as shown colon StartRoot 54 a Superscript 7 baseline b cubed EndRoot = StartRoot 3 squared times 6 times a squared times a Superscript 5 Baseline times b squared times b EndRoot = 3 a b StartRoot 6 a Superscript 5 Baseline b EndRoot Describe the error Sadie made, and explain how to find the correct answer.\

Sadie's error is " she made error in step 2  where "

Because she made error in splitting the powers to simplify the square root

Step-by-step explanation:

Given that " Sadie simplified the expression StartRoot 54 a Superscript 7 b cubed EndRoot, where a greater-than-or-equal-to 0, "

It can be written as where

The given expression is where

To find Sadie's error and explain the correct answer :

Sadie's steps are

 where

 where

(by using the identity

(by using the identity )

Therefore  where

Sadie's error is " she made error in step 2 " where

Because she made error in splitting the powers to simplify the square root

the answer would be c:   ax + b = ax + c

step-by-step explanation: