Book Maths Puzzle Quadratic Equations

I need to know how to solve a quadratic eq.
y-1=(x-3)^2 I have to find the vertex, x-intercepts, and y-int.
Also the same for x^2+2x-3

thank you!!

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Book Other Question

if the square of a number is subracted from seven times the number, the difference is 12. What is the number? A shepard has some sheep. He buys 3 more sheep. Now he has 7 times as many sheep than if he had sold 3 sheep instead of buying 3 sheep. How many sheep does he have now?