The 9th of an AP I three times the5th .find a and d
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Step-by-step explanation:
a= -2d this is right answer it is a form of equation
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SolutioN :-
9th term of the AP
→ a₉ = a + 8d
5th term of the AP
→ a₅ = a + 4d
According to Question :-
9th term of AP is 3 times of 5th term
→ a + 8d = 3( a + 4d )
→ a + 8d = 3a + 12d
→ a - 3a = 12d - 8d
→ - 2a = 4d
→ 2a = - 4d
→ a = - 2d
→ d = - a/2
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