Pre-Algebra: Chapter 2-5
Today, we are working on subtraction of rationale numbers. Remember, just do the inverse of subtraction and ADD the inverse (or opposite) of the number to the other number.
Examples:
A) -5 – 7 is really -5 + (-7) remembering that the + sign is invisible. So this becomes just -5 + (-7) and remembering the adding rule of 2 negatives, the answer becomes -12.
B) -4 – (-5) is really -4 + 5 because 2 negative are a positive (bing-bing! from Ms. Phillips) and the answer is +5 – 4 and the final answer is +1
Algebra: Chapter 2-8
Inverse operation is on the agenda today. The negative sign in front of an expression translates to simply reversing the “SIGN” of each term in an expression and then evaluating or simplifying by combining like terms.
For example -(2x + 4y) becomes -2x -4y and -2(-3x -4y) becomes -2(-3x) – 2(-4y) or 6x +8y.