Show that ` A=[[-8,5],[2,4]]` satifies the equation ` x^2 +4x-42=0 `

Show that A=[[-8,5],[2,4]] satifies the equation A^2 +4A-42=0

Show that A = [(-8,5),(2,4)] satsfies the equation x^2 + 4x - 42= 0 . Hence find A^-1

Show that A=[(-8, 5),( 2, 4)] satisfies the equation A^2+4A-42 I=O . Hence, find A^(-1) .

Find the inverse of each of the matrices given below : Show that the matrix A=[(-8,5),(2,4)] satisfies the equation A^(2)+4A-42I=0 and hence find A^(-1) .

Consider the matrix A=[(-8,5),(2,4)] Show that 'A' satisfies the equation x^2+4x-42=0

If A=[(-8,5),(2,4)] satisfies the equation f(x)=x^(2)+4x-p=0 then p=

If the arithmetic mean and geometric mean of the p^(th) and q^(th) terms of the sequence -16,8,-4,2,… satisfy the equation 4x^2-9x+5=0 , then p+q is equal to "______"

Show that the equation x^9 - 5x^5 + 4x^4 + 2x^2 + 1 =0 has at least 6 imaginary solutions.

If A = [[3,-5],[-4,2]] ,show that A^2 -5A-14I =0.

Show that the equation 3x^(2)+4y^(2)-12x-8y+4=0 represents an ellipse. Find the focus also