ques 7 a of ap solve it quickly
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Step-by-step explanation:
a₁₄ = 2a₈ ......(A)
a₆ = (-8)
A:
a₆ + 8d = 2(a₆ + 2d)
a₆ + 8d = 2a₆ + 4d
8d - 4d = 2a₆ - a₆
a₆ = 4d
4d = (-8)
d = (-8)/4
d = (-2)
a = a₆ - 5d
a = (-8) + 10
a = 2
Sn = n/2 x (2a + (n-1)d)
20/2 x (4 + (20-1)(-2))
10 x (4 -38)
10 x (-34) = (-340)
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So by finding a and d from the given equations we have solved the above mentioned question.
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