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# Noelle used the quadratic formula to solve x^2+10x+16=0. What did Delilah notice that enabled her to solve

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Noelle used the quadratic formula to solve x^2+10x+16=0. Delilah solved it without the quadratic formula. What did Delilah notice that enabled her to solve this equation without using the quadratic formula?

Guest Aug 12, 2017

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+25975
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Delilah noticed that 16 could be expressed as 2*8 and that 10 could be expressed as 2 + 8.

Therefore, the equation can be written as (x + 2)(x + 8) = 0

Hence x = -2 and x = -8

.

Alan  Aug 12, 2017
Sort:

#1
+25975
+1

Delilah noticed that 16 could be expressed as 2*8 and that 10 could be expressed as 2 + 8.

Therefore, the equation can be written as (x + 2)(x + 8) = 0

Hence x = -2 and x = -8

.

Alan  Aug 12, 2017

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