Question

x5= -45,x9=15 find its x20​

Answer 1

Step-by-step explanation:

x5=-45. x9=15

x+(n-1)d=-45

x+(4-1)d=-45

x+3d=-45........1

x+(n-1)d=15

x+(9-1)d=15

x+8d=15.....…..2

dividing equation 2 from 1

x+8d=15

x+3d=-45

-. -. +

5d=60

d=60/5

d=12

pulling d=12 in equation 1

x+3*12=-45

x=-45-36

x=-81

a20=a+(20-1)d

=-81+19*12

-81+228

a20=147 is the answer

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