exam Maths Puzzle Numerical Ability

15. Find the x-intercepts.

y=x^2-2x+4

x^2-2x+4=0

I then tried to factor however, there are no multiples of four that would equate to two. What am I not doing?

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exam Other Question
solve using matrix methods

x + 4y = 8
2x + y = 9



Thank you for your help. A random sample of 56 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours. Construct a 95% confidence interval for the population mean.