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the second term of a GP is 36 more than the first term. The difference between the 4th and the 3rd terms is 900. Calculate the common ratio and the first term of the GP

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a1, a1 + 36, a3, a3 + 900

(a1 + 36) / a1 = (a3 + 900) / a3

1 + (36 / a1) = 1 + (900 / a3)

a3 = r^2 * a1

36 = 900 / r^2 ... 6 r = 30

Please solve for me

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