LEARN · EXPLAIN · REVISE

Find the major-axis length.

Read the idea, work independently, then explain what changed.

TOPIC 01

Conic sections: mixed review

A mixed assessment: identify the method, justify it and revise your reasoning.

Use one hint at a time. A correction explains what changed, not just the final answer.

01 / Foundation#Your turn

x^2/484+y^2/400=1

For a horizontal major axis a>b>0; the larger denominator specifies the major axis.

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Translate the geometric condition into a coordinate equation.

Hint 2

Use this intermediate relation.

\text{major axis}=2a

Worked solution

The requested value is 44.

Checks and common pitfalls: An axis is twice the corresponding semiaxis.

Think first. Reveal a hint when the class is ready.

Teacher preparation and assessment