save_figs = F

# Problem 2:
#
pr = polyroot( c( 5, 2, 1 ) ) 
print(pr)

solve( matrix( c( 1, -4, 4, 1 ), nrow=2, ncol=2, byrow=TRUE ), c( 3, 0 ) )


# Problem 15:
#
A = matrix( c( 1, 1, -2, 1 ), nrow=2, ncol=2, byrow=T )
b = c( 1/2, 2 )
x = solve( A, b )
print(x)


# Problem 18:
#
A = matrix( c( 1, 1, 3, -1 ), nrow=2, ncol=2, byrow=T )
b = c( 5/3, 4/3 )
x = solve( A, b )
print(x)