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Quadratic Graphs

CONCEPTUAL
MathematicsAlgebra|Ages 13—14|ID: mt_GZuoYaDdWd

Recognise that quadratic functions produce curved (parabolic) graphs, distinguish them from linear graphs, and use plotted quadratic graphs to estimate values and find approximate solutions

Mastery Evidence

  • Explain why x² produces a U-shaped curve rather than a straight line
  • Plot a simple quadratic such as y = x² − 4 from a table of values
  • Read approximate solutions from a quadratic graph (e.g., where y = 0)

Assessment Prompt

“Can [child] recognise that an equation like y = x² produces a curved graph rather than a straight line, and use a plotted curve to estimate values?”

Curriculum Standards4 alignments

8.F.3Common Core State Standards for Mathematics
Linear and non-linear functions

Interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; give examples of functions that are not linear. For example, the function A = s² giving the area of a square as a function of its side length is not linear because its graph contains the points (1,1), (2,4) and (3,9), which are not on a straight line.

F
8.F.5Common Core State Standards for Mathematics
Qualitative description of functions

Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally.

F
KS3.Maths.Alg.12The national curriculum in England
Estimate Values and Solve Simultaneous Equations

use linear and quadratic graphs to estimate values of y for given values of x and vice versa and to find approximate solutions of simultaneous linear equations

Mathematics · Key Stage 3
KS3.Maths.Alg.9The national curriculum in England
Graphs of Linear and Quadratic Functions

recognise, sketch and produce graphs of linear and quadratic functions of 1 variable with appropriate scaling, using equations in x and y and the Cartesian plane

Mathematics · Key Stage 3

Prerequisites1

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