Question 4 Use elementary row operations, or otherwise, to find the following: (a) 1 1 1 -2 1 3 4 5 1 (b) 1 1 -1 1 -1 -1 -1 1 (c) 2 3 6 2 3 1 1 -2 40 1 3 112-1

b. Find a QR-factorisation of 1 -1 1 1 1 1 -1 0

find the product of 4 6/4×3 4/3

Question Completion Status: QUESTION 9 Multiply: 2x5(3x³ - x²-2) 6x15 - 2x10 - 4x5 6x8-2x7-4x5 5x15 .x10-4 0x8-2x3-4x5 QUESTION 10 Remove the parentheses and simplify: O7w-6 25w - 6

4. If the product (-2+7i)(c+di), where c and d are real numbers, was placed in standard form, then which of the following expressions would represent its real component? (1) -2c-7d (3) 7c +2d (2) 7d- 2c (4) 7c- 2d

If 3x= 5, then 3x+3=___

3) Multiply the following: (3x-4)3 4) Divide using long division: (5xª – 2x² + 3x – 4) ÷ (x² + x – 2) 5) Factor using substitution: 8(2x + y)2 – 10(2x + y) + 3

WHY it is 3n instead of 3(row 2 and row 3)

Explain Row multiplication?

Aida is working on the multiplication problem 76.7 x 6.23. She multiplies 767 × 623 to get 477841, but isn't sure where to place the decimal point. How can she reason about the size of the factors to decide where the decimal goes? (She doesn't know the rule about counting decimal places, and you're not there to tell her, and you will get no credit for your answer if you refer to that rule.)