QuadraticsFactoring, the quadratic formula, the discriminant and parabola anatomy.9th GradePARABOLA ANATOMYvertexrootrootaxis of symmetryy = ax² + bx + ca > 0 → opens up · a < 0 → opens downAxis of symmetry: x = −b / 2ay-intercept is c. Roots are where y = 0.Roots, zeros, solutions and x-intercepts all mean the same thing.SOLVE BY FACTORING — try this firstx² + 7x + 12 = 0 → (x + 3)(x + 4) = 0 → x = −3 or −4Find two numbers that multiply to c and add to b. Here: 3 × 4 = 12 and 3 + 4 = 7.Zero product property: if two things multiply to zero, one of them must be zero.THE QUADRATIC FORMULA — always worksx = ( −b ± √(b² − 4ac) ) / 2aWrite a, b and c down first, with their signs. Most errors are a lost minus sign.x² + 7x + 12: a = 1, b = 7, c = 12.THE DISCRIMINANT b² − 4acpositive → 2 real rootszero → 1 repeated rootnegative → noneCheck it before you factor — it tells you whether factoring will work at all.Quadraticslearnposters.com
Quadratics — printable math wall chart from LearnPosters. Free vector PDF, US Letter and A4.

Questions about the Quadratics poster

Who is the Quadratics poster for?
Quadratics is filed under 9th Grade (ages 14–15), so it matches what that year asks a child to remember. It is equally useful to an older student revisiting math, and to the parent or teacher answering the question at the kitchen table.
When should you use the Quadratics poster?
The summary sheet for the quadratic posters in this set. A wall chart earns its place by being glanceable from where the work is happening, so Quadratics belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
What other posters go with Quadratics?
Absolute Value Equations, Arithmetic Sequences and Difference of Squares sit alongside Quadratics in the 9th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Absolute Value EquationsArithmetic SequencesDifference of Squares
Is the Quadratics poster free to download and print?
Yes. Quadratics downloads as a free PDF with no account, no email and no watermark, like everything else in the 9th Grade set. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Quadratics poster print at?
Quadratics is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Quadratics loses nothing.Printing guide

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