2. Let R be the set of 2 x 2 matrices with integer entries and lower left entry equal to zero, i.e.: R = {(8 d) [a,b,c € z}. You may assume that R, together with the usual addition and multiplication of matrices, is a ring, Define : R→ Z by ·(()). Show that is a ring homomorphism. <= a.

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Q: don't understand how phi(a+c)=a+c. Please explain. Thank you

A: Given

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