Question

4²+5²+20²=?
what is the answer?
show the method also​

Answer 1

Answer:

Hey mate! Here's your answer:

Step-by-step explanation:

4² + 5² + 20² = 21².

The trick used here is:

a² + (a + 1)² + {a(a + 1)}² = {a(a + 1) + 1}² where a = 4.

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