Question

how many terms of ap -10,-8 must be taken to get the sum of 26

Answer 1

Step-by-step explanation:

a=-10

d=2

n=?

We know that

n*(2a+(n-1)d)//2=26

n*(-20+2n-2)//2=26

-22n+2n²=52

2n²-22n-52=0

n²-11n-26=0

n²-13n+2n-26=0

n(n-13)+2(n-13)

n=-2//n=13

n=13

Hope it helps

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