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المساحات والحجوم: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

أجد مساحة المنطقة المحصورة بين g(x)=4x+12g(x)=4x+12 وf(x)=4x2f(x)=4-x^2 في الفترة [1,2][-1,2].

المساحات والحجوم

The answer

على الفترة [1,2][-1,2] يكون g(x)f(x)=x2+4x+8g(x)-f(x)=x^2+4x+8 موجباً، لذلك A=12(x2+4x+8)dx=[x33+2x2+8x]12=33A=\int_{-1}^2(x^2+4x+8)dx=\left[\frac{x^3}{3}+2x^2+8x\right]_{-1}^2=33 وحدة مربعة.

Explanation

هذا يقيس بناء الفرق الصحيح حتى لو كان أحد الاقترانين خطياً والآخر تربيعياً.

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