exam Maths Puzzle Numerical Ability

Use a special product formula to factor the perfect square trinomial.

b2 + 18b + 81

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exam Other Question

What is the transformational form of the quadratic function described by the mapping rule (x,y)-- (x+2,3/4y-3) ? Tom can do a job in 3 hours, Dick in 4 hours, and Harry in 6 hours. If they do it together (and do not delay each other), how long does the job take?