tangent line & area problem from Oxford

This is a calculus problem from the Oxford maths admission test in 2021. The question is a line is tangent to the parabola y=x^2 at the point (a, a2) where a is positive. What is the area of the region bounded by the parabola, the tangent line, and the x-axis? This question is great for calculus 1 and AP calculus students!
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