f U1 and U2 are both upper triangular matrices, and L1 and L2 are lower triangular which of the following are triangular? [U1+U2, U1U2, U2^2, U1+L1, U1L1, L1+L2].

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A: Using Matrix row reduction, we can solve the given system of equations.

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A: D=(16,19,21)E=(16,18,19,20)F=(15,17,18,19,21)

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Q: f(x) = -(x + 1)² +3 for -6 for x + 4 for − 4 ≤ x -1 Find f(-4)

A: