if in an AP (t11)2-(t1)2=1500 and (t11-t​1​)=30,then what is t11?

We have, t11 -  t1 = 30    .....1Now, t112 - t12 = 1500t11 -  t1 t11 +  t1  = 150030t11 +  t1  = 1500t11 +  t1  = 50   .....2Adding 1 and 2, we get    2t11 = 80t11 = 802 = 40

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