exam Maths Puzzle Numerical Ability

How do you find the term that should be added to the expression to make a perfect square trinomial?

x^2 + 11x
x^2 + 4/5x

how?

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exam Other Question

The sum of two numbers is 84. The second is 9 more than 4 times the first. What are the two numbers? The United States Congress is made up of 100 members of the Senate and 435 members of the House of Representatives. How many 5-member senatorial committees are possible?