Find `x` when `7:x::x:28`

Find x and y when (7x-2y)/(xy)=5 (8x+7y)/(xy)=15

Find x and y when (7x-2y)/(xy)=5,(8x+7y)/(xy)=15

Find (dy)/(dx) , when y=x^(5)+x^(4)+7

Find the remainder when 2x^2+7x^2-x+8 is divided by x-1.

Find x, y, z when [{:(5,3),(x,7):}]=[{:(y,z),(1,7):}].

A polynomial in x of degree 3 vanishes when x=1 and x=-2, ad has the values 4 and 28 when x=-1 and x=2, respectively. Then find the value of polynomial when x=0

Find the value of the expression (7x-2) when x= -2.

Find (dy)/(dx) , when y= x^(5) + x^(4) + 7

Find the remainder when x^2+4x^2-7x+6 is diided by x-1.