The sum of the digits of a two-digit number is 9. When the digits are reversed, the new number is 9 more than the original numbe
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Answer:
Step-by-step explanation:
You factor out the common term first.
You should get the equation below.
then you get rid of the negative inside
and will be simplified to this.
The correct next step Amy could take is to factor (x^2 - 16) on the left side of the equation to yield (x + 4)(x – 4)(x + 2) = 0.
The equation is given as:
The possible next steps are:
1. Expand the equation as follows
2. Express x^2 -16 as a difference of two squares as follows
However, the correct step in this case is to factor x^2 - 16 as a difference of two squares to give
This is so, because the question says Amy is trying to solve for variable x.
This step will ensure that she gets the possible values of x, unlike expanding the whole equation .
Hence, the correct next step is
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