Variation equation

Solve combinatorics equation:

V(2, x+8)=72

V(2,x+8) is variations, second class, from x+8 items.

Final Answer:

x =  1

Step-by-step explanation:

V(2, x+8)=72 (x+8) (x+7)=72  (x+8) (x+7)=72 x2+15x16=0  a=1;b=15;c=16 D=b24ac=15241(16)=289 D>0  x1,2=2ab±D=215±289 x1,2=215±17 x1,2=7.5±8.5 x1=1 x2=16 x>0 x=x1=1

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You need to know the following knowledge to solve this word math problem:

combinatoricsalgebraGrade of the word problem

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