Question

Find the 1st term of an AP whose 7th term is 4 and the common difference is -4

Answer 1

Answer:

here is you ans . 28

Step-by-step explanation:

We know that , tₙ = a + (n-1) x d

        Therefore, t₇ = a + ( 7-1 ) X (-4)

                             4 = a + ( -24)                    [ t₇ = 4 ]

                             4 = a - 24

                              a = 28

Answer 2

Answer:

$a = 28$

Step-by-step explanation:

$a_{7} = 4 \\ d = - 4 \\ t_{n} = a + (n - 1)d \\ a_{7} = a + (n - 1)d \\ 4 = a + (7 - 1)( - 4) \\ 4 = a + 6 \times ( - 4) \\ 4 = a + ( - 24) \\ 4 = a - 24 \\ - a = - 24 - 4 \\ - a = - 28 \\ a = 28$

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