GCEFurther MathematicsIntegration2021

Find the area enclosed between the curve $y = x^2 - 4$ and the x-axis

A$\frac{32}{3}$ square unitsCORRECT
B8 square units
C$\frac{16}{3}$ square units
D16 square units
AI
Toaster Teacher
Why the answer is A, and why the others tempt you.
The curve crosses the x-axis at x = -2 and x = 2. The area = |∫₋₂² (x² - 4) dx| = |[x³/3 - 4x]₋₂²| = |(8/3 - 8) - (-8/3 + 8)| = |16/3 - 16| = |-32/3| = 32/3 square units. Since the curve is below the x-axis between x = -2 and x = 2, the absolute value is taken.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →

Practice more Further Mathematics questions

GCE Further Mathematics has thousands more questions like this — with Worked answers on every one.