If , and , the value of…

MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices

Problem

If A=[1−12−1]A = \begin{bmatrix} 1 & -1 \\ 2 & -1 \end{bmatrix} , B=[a1b−1]B = \begin{bmatrix} a & 1 \\ b & -1 \end{bmatrix} and (A+B)2=A2+B2(A+B)^2 = A^2 + B^2 , the value of a+ba+b is (1) 4 (2) 6 (3) 5 (4) 7

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