exam Maths Puzzle Numerical Ability

Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx+c=0. Solutions are -9,4.
The answer I got is x^2+13x-9=0. Is that right?

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exam Other Question
The area of a rectangle is 104. Find the length and width if the length is 5 times greater than its width. Find the following if f(x) = 4x -3 f(-1)

-1 = 4(-1) - 3
-1 = -4 -3
-1 = -1

Double checking to see if I did these right