Recall that the product (a + b)(a - b) is the
difference of squares, a? -b2.
Examine this same product for radical
expressions.
Choose the product of (3+/7)(3-7)
0 6 -357 +31/7 - /14
0 9- 21 + 121 - 149
9-37+37 - 49

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Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.