book Maths Puzzle Numerical Ability

I need to find out how you would find the y-intercept, equation for the line of symmetry, and the vertex of a problem such as this:
(x+3)(x+2)
I know that the equation -b/2a come

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The area of Sean;s Retangular front lawn is 302 3/8 square feet. If the lawn has a length of 20 1/2 feet, What is the width in feet? Let H be a subspace of dimension n-1 of an n-dimensional vector space V. Show that if U is a subspace of B and U is not included in H, then H+U=V and the (dimension of the intersec