exam Maths Puzzle Numerical Ability

What is the y intercept for this equation:y=x^2+2x-1?

so far:1=x^2+2x
1=x(x+2)

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exam Other Question

1.All squares are rectangles.
2. If a quadrilateral is a ractangle, then it has congruent diagonals.

I do not understand how to come to a conclusion on the question.
it says t
Factor
64w^3 + 8x^3



Solve
2x^2 - 11x + 13 = 1