Brackets :: Level 10
Expand algebraic expressions containing brackets and simplify the resulting expression in this self marking exercise.
This is level 10: expanding products of three binomials (cubic expressions). You can earn a trophy if you get at least 9 correct and you do this activity online.
Simplify the following expressions by removing the brackets. Order the terms in your answers so that variable terms come before the constants and the variables are in decreasing power order. Use the [²] and [³] buttons to insert exponents into your answer .
Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.
When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.
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Comment recorded on the 24 May 'Starter of the Day' page by Ruth Seward, Hagley Park Sports College:
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Level 1 - Collecting like terms when 1 term is repeated
Level 2 - Collecting like terms when 2 terms are repeated
Level 3 - Multiplying a single positive integer over a bracket
Level 4 - Multiplying a single negative integer over a bracket
Level 5 - Multiplying a variable over a bracket
Level 6 - Expanding products of two simple binomials
Level 7 - Expanding products of two binomials
Level 8 - Squaring a binomial
Level 9 - Simplifying more complex expressions involving brackets
Level 10 - Expanding products of three binomials (cubic expressions)
More Algebra - There are many more exercise, Starters and other Algebra resources on the main Algebra page.
Remove the brackets to give 5d - 2d - 2
[note that everything inside the bracket is subtracted from 5d]
Collect like terms to give 3d - 2
Remove the brackets to give 9d - 7 - 5d + 2
[note that negative 2 becomes positive due to the negative sign in front of the second bracket]
Collect like terms to give 4d - 5
Multiply each term inside the bracket by 4 to give 8d + 16
Multiply each term inside the bracket by negative 5 to give -25d - 20
Multiply each term inside the bracket by 4d to give 20d² - 20d
Multiply each term of the first bracket by each term of the second bracket to give d² + 7d - 2d - 14
Collect like terms to give d² + 5d - 14
F.O.I.L. First Outer Inner Last
Multiply each term of the first bracket by each term of the second bracket to give 12d² + 8d + 21d + 14
Collect like terms to give 12d² + 29d + 14
Write as (3d + 2)(3d + 2) then expand as in the previous example to give 9d² + 12d + 4
Multiply out the brackets to give 15d + 5 - 2 + 4d
Collect like terms to give 19d + 3
Multiply out the first pair of brackets to give (2x²+2x-4)(x+2)
Multiply each term in the first set of brackets by each of the terms in the second set of brackets then collect like terms to give 2x3 + 6x² - 8
Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly.