y^(iv)-4y=0 taking 4y to RHS we get y^(iv) = 4y y^(iii) = integral of(4y) =4 y^(ii) = integral of(4) = 0+ A note:The integral of a constant C with respect to y is Cy+ A y^(i) = integral of(A) = 0 +A y =(intgral of A) =0+A So the general solution is y= A(constant). Solution y^(iv)-4y=0 taking 4y to RHS we get y^(iv) = 4y y^(iii) = integral of(4y) =4 y^(ii) = integral of(4) = 0+ A note:The integral of a constant C with respect to y is Cy+ A y^(i) = integral of(A) = 0 +A y =(intgral of A) =0+A So the general solution is y= A(constant)..