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2 years ago

15

Để đánh giá mức độ cân đối giữa thời gian học bài ( Y: giờ/ngày ) và thời gian vui chơi ( X: giờ/ngày ), người ta khảo sát 120 h

ọc sinh và thu được bảng kết quả sau

1 answer:

Naya [18.7K]2 years ago

3 0

Answer:

Dygjsu5, you rugigb jfifidodod ifusud8guvi ivic

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Step-by-step explanation:

Here, the given expression is $(x-9)(3x-7) + (3x^{2} - 5x+2)$

Now, simplifying the above expression in parts, we get

$(x-9)(3x-7) = 3x^{2} - 7x -27x + 63 = 3x^{2} - 34x + 63$

hence, combining both parts:

$(x-9)(3x-7) + (3x^{2} - 5x+2)$ $=(3x^{2} -34x +63) + (3x^{2} - 5x+2)$

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The above expression is of the STANDARD FORM: $ax^{2} +bx + c$

Hence, the standard form of $(x-9)(3x-7) + (3x^{2} - 5x+2)$ $=6x^{2} - 39x + 65$

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