exam Maths Puzzle Numerical Ability

true or false:
1. every equa;ateral triangle is isosceles
2.the internal angle and its external angle of a polygon are supplementry
3. an isosceles traiangle can be scalene
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exam Other Question
Give an example of a pair of inverse operations. Sir/Madam,
Could you please help me in solving the following problem:

4x^2+10x+25=(4x^2+20x+25) - how do I get the answer as (4x^2+20x+25).

Regards and thank you.