Mathematics (No spaces between words)

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Across
  1. 3. System where lines have the same slope.
  2. 4. Inverse of an exponential function.
  3. 5. Vertical line that goes through the vertex.
  4. 8. Maximum or minimum points of a function.
  5. 9. x^2 + 7x + 12 ---> (x + 3)(x + 4)
  6. 10. a(b + c) = ab + ac
  7. 14. System where lines are exactly each other.
  8. 18. Two lines crossing each other.
  9. 19. 1, 4, 9, 16, 25, etc.
Down
  1. 1. Number expressed in a + bi form.
  2. 2. Quadratics, Cubics, Quartics, etc.
  3. 3. a^2 + b^2 = c^2
  4. 6. Quadrilateral where all sides are congruent and 90 degree angles.
  5. 7. 1/0, x/0, etc.
  6. 11. A solid (3-dimensional) object which has six faces that are rectangles.
  7. 12. Sum of interiors angles in a Triangle.
  8. 13. Quadrilateral where both pairs of sides are parallel and the diagonals bisect perpendicularly.
  9. 15. This derivative is the slope of a function.
  10. 16. Distributions having two local maxima.
  11. 17. Symbol for finding areas under curves.