Suppose you have a n × n matrix. How many multiplications are needed to row reduce it? Assume you're using the fang shang reduction, and include multiplications by 0 (unless you want to make the problem more challenging!). Show your work below.

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Q: 6. Find two ideals I₁ and 12 of the ring Z such that a. I, U2 is not an ideal of Z. b. I₁ U2 is an…

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Q: Can you find A-1 using the super augmented matrix and then check the answer please, thank you.

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Q: 18. With H and K as in Exercise 16, prove that HMK is a normal subgroup of H.

A: Please complete the missing important information for further explanations.

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Q: Home - work Completely Factorise a) x²+3x+2 b)x2-40c+5

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Q: 4. If I₁ and 12 are two ideals of the ring R, prove that I₁₂ is an ideal of R.

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