Practice Quadratic Standard Form in Math

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

The standard form of a quadratic equation is ax2+bx+c=0, where a≠0 and a, b, c are real number coefficients.

Think of it as a template with three slots: a controls the width and direction of the parabola, b shifts it sideways, and c slides it up or down. Every quadratic can be written this way by expanding and collecting like terms.

Showing a random 20 of 50 problems.

Example 1

medium
Find the x-coordinate of the vertex of y=2x2−12x+7 using standard form.

Example 2

easy
Identify a, b, c in 3x2+5x+2=0.

Example 3

challenge
Two quadratics x2+bx+c=0 share roots 2 and −3. Find b and c.

Example 4

medium
In standard form, what does the constant term c represent on the graph?

Example 5

medium
Convert (2x−1)(x+3)=0 to standard form.

Example 6

easy
Is 5x+2=0 a quadratic equation?

Example 7

easy
Identify b in 2x2−7x+3=0.

Example 8

easy
Is 4x−x2+1=0 in standard form? If not, rewrite it.

Example 9

easy
In x2+3x−10=0, what is c?

Example 10

easy
Write x2=9 in standard form.

Example 11

easy
Write 3x2+2x=5 in standard form.

Example 12

easy
Write 7x−2x2+5=0 in standard form.

Example 13

medium
Convert y=2(x−1)(x+4) to standard form.

Example 14

challenge
A quadratic in standard form has a=1, sum of roots 5, product of roots 6. Write it.

Example 15

medium
Does the parabola y=−3x2+x−1 open up or down?

Example 16

hard
A quadratic in standard form has c=−12 and roots 3 and −4. Find the leading coefficient a.

Example 17

easy
Identify c in x2−6x=0.

Example 18

hard
Given the parabola y=ax2+bx+c passes through (0,3), (1,0), and (−1,8), find a,b,c.

Example 19

medium
Expand 3(x−2)(x+1) and write in standard form.

Example 20

hard
For what value of k is kx2−4x+1=0 not a quadratic equation?