exam Maths Puzzle Numerical Ability

(2x+4)(2x+4)(2x+4)= v

Is it 8x +64?

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exam Other Question

Prove that if A is an n x n primitive matrix. Then the limit as k goes to infinity of (A/r(A))^k = xy^T where Ax=r(A)x, x>0,y^TA=r(A)y^T,y>0,y^Tx=1.

NOTE : y^T is read as y tr factor x^3+2x^2-5x-6 by using synthetic division.