Math, asked by lindamagaling, 3 months ago

Find a1, S15 = -90 and d= -7​

Answers

Answered by manasa1065
2

Answer:

S15=152[2a1+(15−1)(−7)]=−90

⟹152[2a1+14(−7)]=−90

⟹15[a1+7(−7)]=−90

⟹a1−49=−6

⟹a1=43

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