Question

a , b, c ,d, e, f are in A.P then find the value of a²-b²+c²-d²+e²-f² having common difference D=-1

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​explanation needed​

Answer 1

Answer:

a = a

b = a + d = a - 1

c = a + 2d = a - 2

d = a + 3d = a - 3

e = a + 4d = a - 4

f = a + 5d = a - 5

≈> a² - (a-1)² + (a-2)² - (a-3)² + (a-4)² - (a-5)²

≈> a²- a²- 1 + 2a + a²+ 4 - 4a - a²- 9 + 6a + a²+ 16 - 8a - a²- 25 + 10a

≈> 6a - 15

Hope this help you

Answer 2

Answer:

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