exam Maths Puzzle Numerical Ability

two consecutive postive integers sum of squares is 85

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Hi. Can someone please help me? I need to solve these arguments using the 18 rules of inference. I'm stuck on these 4.

I. 1) [A horseshoe (B v C)] horseshoe (D horseshoe A)
Please help me solve the following problem:

State the x-intercepts of the graph of the equation. Then find the coordinates of the vertex.

y=(x+3)(x-5)