<PRE><B>Question 1025756</B>
should be (8-x) * (8+x)


multiply them out and you get:


8 * 8 + 8 * x - x * 8 - x * x


simplify to get 64 + 8x - 8x - x^2


combine like terms to get 64 - x^2


the + 8x and the - 8x cancel each other out.


you are using the distributive law of multiplication that says.


(a + b) * (c + d) = a * c + a * d + b * c + b * d


simplify this and you get ac + ad + bc + bd


every term in the multiplier needs to multiply every term in the multiplicand one time.


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