Question

4,a,9 are in G.P what is the value of a?
Can't it be -6?

Answer 1

Answer:

Step-by-step explanation:

let

common difference we know that in GP

d= ratio of t2/ratio of t1

so

through we that . we conclude these eq.

t2/t1=t3/t2

a/4=9/a

a^2=36

a=6

hope u like my ans ^_^.

Answer 2

4 , a , 9 are in GP.

Thus, r = a2/a1 = a3/a2

a/4 = 9/a

a^2 = 36

a = +/-6.......●

Yes, a can be -6, because if you multiply a = -6 with r = -6/4 then, you derive 9.

Same condition is with a = 6 because then r will be 6/4 and we derive 9 again.

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Hope it was helpful.