Review of Multiplication
A review of how to multiply signed numbers.
Subject: sign
Transcript: ABSOLUTE VALUE, THINK OF THAT AS THE NUMBER PART, AND A SIGN. TO GET THE ABSOLUTE VALUE, IGNORE THE SIGNS AND MULTIPLY THE TWO FACTORS. THAT'S 3 TIMES 4, OR
Practical Problem: Subtracting Boxes in a Warehouse
A practical problem solved using subtraction in an algebraic expression.
Subject: sign
Transcript: SIGNS, AND COMBINE LIKE TERMS. 6M MINUS M IS 5M. 12S PLUS 2S IS 14S. WE SIMPLY COPY THE 8L. THINK ABOUT IT. THE ALGEBRA TELLS US THAT WE ARE LEFT WITH 8
Practical Problem: The Area of a Garden
Using multiplication of polynomials in a practical problem.
Subject: sign
Transcript: , BOTH FACTORS ARE NEGATIVE, SO THE ANSWER IS POSITIVE 9K, OR JUST 9K. NOTICE THAT WE OBTAIN THE SIGN OF THE PRODUCT JUST AS WE DID FOR ORDINARY NUMBERS
Subtracting Like Terms
Subtracting like terms demonstrated and applied to a practical problem.
Subject: signed numbers
Transcript: MEANING, IT'S JUST FOR CLARITY. TO REMIND US THAT THIS NUMBER OF CARTONS IS WHAT WE STARTED WITH. BUT AFTER A MINUS SIGN, THE PARENTHESES ARE REQUIRED
Problems Involving the Multiplication of Monomials
Demonstration of how to multiply monomials.
Subject: sign
Transcript: 5 IS 35. AS FOR THE J AND M, AS BEFORE, WE JUST RECOPY THEM. THE ANSWER IS 35JM. NEGATIVE 7J TIMES 5M? SAME IDEA, BUT THE SIGNS ARE DIFFERENT, SO WE
Rules for Subtracting Algebraic Expressions
Rules for subtracting one algebraic expression from another and a step-by-step demonstration.
Subject: sign
Transcript: NARRATOR: TO SUBTRACT ONE ALGEBRAIC EXPRESSION FROM ANOTHER, FIRST, CHANGE SUBTRACTION TO ADDITION. NEXT, CHANGE THE SIGN OF EVERY TERM IN THE
Rewriting the Formula for Temperature Conversion
Rewriting the formula for temperature conversion to solve for F.
Subject: sign
Transcript: EQUATION BECOMES 9C EQUALS 5F MINUS 160. WE CAN MOVE 160 TO THE LEFT SIDE BY CHANGING ITS SIGN. THEN, DIVIDING BOTH SIDES BY 5, WE HAVE OUR ANSWER. 9/5 C
Shortcuts for Solving Equations
A review of shortcuts that can be used in solving equations.
Subject: sign
Transcript: NARRATOR: WE DISCOVERED A COUPLE OF WORTHWHILE SHORTCUTS. FIRST, ANY TERM CAN BE TRANSFERRED TO THE OTHER SIDE OF AN EQUATION BY CHANGING ITS SIGN
Shortcut for Solving Equations, A
Any term in an equation can be transferred to the other side if you change the sign. An explanation of this shortcut for solving equations.
Subject: sign
Transcript: CHANGED THE SIGN. THIS IS A SHORTCUT. ANY TERM IN AN EQUATION CAN BE TRANSFERRED TO THE OTHER SIDE IF WE CHANGE THE SIGN. IN THE EQUATION 3X PLUS 5 EQUALS
Subtraction Problem
MM_ALG_03K_011
Subject: sign
Transcript: WE BEGIN BY CHANGING SUBTRACTION TO ADDITION. NEXT, WE CHANGE THE SIGNS OF ALL THE TERMS IN PARENTHESES. 5XY BECOMES MINUS 5XY. AND MINUS 3Z BECOMES