book Maths Puzzle Numerical Ability

x2+9x=x(__+9)

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book Other Question

Find two numbers, given that the second is 3 times the first. If you multiply the first number by the second number and the second number by 4, the sum of the products is 420. Determine whether each relation is a funtion, justify your answer.

{(0,1), (1,0), (2,1), (3,1), (4,2)}

HOw do i solve this problem?