Question

6. Find the value of the following when x = 3 and y = -3. (1) 9x2 + 16y2 – 24xy (ii) 29x2 +81y - 19 xy​

Answer 1

Answer:

$1) \: (9 \times 3 \times 2) + (16 \times ( - 3) \times 2) - (24 \times 3 \times ( - 3)) \\ = 54 + ( - 96) - ( - 216) \\ = 54 - 96 + 216 \\ = 270 - 96 \\ = 174$

$2) \: (29 \times 3 \times 2) + (81 \times ( - 3)) - (19 \times 3 \times ( - 3)) \\ = 174 + ( - 243) - ( - 171) \\ = 174 - 243 + 171 \\ = 345 - 243 \\ = 102$

Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

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