Question

solve for x :8+10+12+.......+x=1170​

Answer 1

Step-by-step explanation:

then find the value of x by doing middle term breaking....

Answer 2

Answer:

we can solve it by Ap

here first term A=8 and common difference D=10-8=2

now sun of all tern =1170

sol.

an=n/2(2a+(n-1)d)

1170=n/2(2*8+(n-1)2

1170=n/2(16+2n-2)

n/2(14+2n)

2340= 14n+2nsquare

2nsquare+14n-2340=

n square+7n-1170=0