Question

Find three terms of an ap whose sum is 30 and product is 640

Answer 1

Answer:

three terms are

4 , 10 & 16

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Step-by-step explanation:

let say three terms are

a-d  , a , a+d

Sum = 30

a-d + a + a+d = 3a = 30

a =10

three terms are

10-d  , 10 , 10+d

(10-d)*10*(10+d) = 640

100 -d^2 = 64

d^2 = 36

d = +/-6

three terms are

10-6 , 10 , 10+6  =>  4 , 10 , 16

10-(-6) , 10 , 10+(-6) =>  16 , 10 , 4