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Algebra> The number 2, a, b are in arithmetic prog...

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The number 2, a, b are in arithmetic progression and a, b, 9 are in geometric progression, How can I find the values of a and b?

Junior Huriavi , 7 Years ago

Grade 12

2 Answers

Swaraj

Last Activity: 7 Years ago

a=2 + d

b=2 + 2d

b=a x r

9=b x r

4 variables 4 equations . solving them you will get a=4 and b=6

And also d=2 and r=1.5

krishna bhagat

Last Activity: 7 Years ago

Not so tough using equations

a=2 + d

b=2 + 2d

b=a x r

9=b x r

a=4

b=6

d=2

r=1.5

a=4 and b=6

And also d=2 and r=1.5

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