exam Maths Puzzle Numerical Ability

Find the x- intercepts of y=x^2-x-5 can any one help?

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exam Other Question

find the slope of the line containing the following

1)(-1,6)and(0,3)
2)(12,-1)and(34,2)
3)(6,6)and(7,4)

THANKS A LOT VERY MUCH !!!!!!!! if t= v-u/a,find a when t=1,u=1 2/3and v=3 1/2