The square of 9 less than a number is 3 less than the number. What is the number?
2 answers:
Answer:
D. 7 or 12
Step-by-step explanation:
Just took it. Edg 2020. Hope this helps :)
Answer:
7, 12
Step-by-step explanation:
( n-9)^2 = n-3
Foil the right
n^2 -18n +81 = n-3
Subtract n from each side
n^2 -19n +81 =-3
Add 3 to each side
n^2 -19n +84 = 0
Factor
What 2 numbers multiply to 84 and add to -19
-12*-7 = 84
-12+-7 = -19
( n-7) (n-12) =0
Using the zero product property
n-7 =0 n-12= 0
n=7 n=12
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Step-by-step explanation:
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