exam Maths Puzzle Numerical Ability

Factor completely. Use parentheses and do NOT use spaces.
14+52x-16x^2

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exam Other Question

v=csqrt2gh/sqrt1+(1/k-1)^2

Change the subject from v to k one machine in print shop can prodce a certain number of pages twice as fast as another machine.operating together,these machines can produce this number of pages in 8 mins.how long would it take each machine,working alone,to produce this number of pages?