Class 10 cbse
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a6=-10
A10=-26
a 15=???
a6=a+5d-------(1)
-10=a+5d
A10=a+9d
-26=a+9d-------(2)
from 1and 2 equation.
a+5d=-10
a+9d=-26
- - +
________
4d =-16
d=-4
put d in 1 equation
a+5×-4=-10
a+(-20)=-10
a=-10+20
a=10
a15=a+14d
=10+14×-4
= 10+(- 56)
=10-56
= - 46
please mark me brainliest and follow
A10=-26
a 15=???
a6=a+5d-------(1)
-10=a+5d
A10=a+9d
-26=a+9d-------(2)
from 1and 2 equation.
a+5d=-10
a+9d=-26
- - +
________
4d =-16
d=-4
put d in 1 equation
a+5×-4=-10
a+(-20)=-10
a=-10+20
a=10
a15=a+14d
=10+14×-4
= 10+(- 56)
=10-56
= - 46
please mark me brainliest and follow
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