Find the value of 'x' if
(i) `1+6+11+...+x=189`
`(ii) 1+1+4+7+10+...+x=287`

Find the value of 'x' if 1+6+11+...+x=189

(a) Find the value of x if 1 + 6 + 11 + ... + x = 189. (b) Find the value of x if 3 + 6 + 9 + ... + 96 = x.

(a) Find the value of x if 1 + 6 + 11 + ... + x = 189. (b) Find the value of x if 3 + 6 + 9 + ... + 96 = x.

Find the values of (x-y) , if (i) 3x + 4y = 11 , 4x + 3y = 10 (ii) 3x + 2y = 8 , 2x + 3y = 7

Find the value of x if: (-4)/(27)xx(189)/(64)=(x)/(4)

Find the value of x , (x - 3)/5 + (x - 4)/7 = 6 - (2x - 1)/(35)

find the value of x such that 1+4+7+10+….+x = 715

Find 'x' if 1 + 4 + 7 + 10 + ........ + x = 287 .

Solve for x: 1+4+7+10+...+x=287

Without expanding, find the value of: (i) (x + 1)^4 - 4(x + 1)^3 (x - 1) + 6(x + 1)^2 (x - 1)^2 - 4(x + 1) (x - 1)^3 + (x -1)^4 (ii) (2x - 1)^4 + 4(2x - 1)^3 (3 - 2x) + 6(2x - 1)^2 (3 - 2x)^2 + 4(2x - 1) (3 - 2x)^3 + (3 - 2x)^4