% Vraag 1 

t=1:5;
B = [t;t.^2;t.^3;t.^4;t.^5]
det(B)

%C =B; C(4,:) = B(4,:) +7*B(3,:)
%det(B) -det(C)

C = B(:,end:-1:1)
det(B) - det(C)

% Vraag 2

t =(-1:0.1:1)';
A = [ones(size(t)) t t.^2]
b =(20:-1:0)'-t.^3

x1 = [10;-10.658;0]
x2 = [-10;8.228;2]

(A*x1)'*(b- A*x1) 
(A*x2)'*(b- A*x2) 
% x1 is de kko 

z1 = b - A*x1
z2 = b - A*x2

z1'*z1
z2'*z2