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We can only add or subtract fractions if they have the same denominators
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How is adding like fractions and adding unlike fractions the same?
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.
Is a part of an expression to be added or subtracted?
Yes.
The parts of an expression that are added or subtracted?
no dumby it is just term
When subtracting variables with exponents do you add or subtract the exponenets?
You cannot ad or subtract variables with different exponents: the exponents must be the same. The coefficients are added or subtracted and the exponent of the answer is the common exponent. (The rules are similar to those for the denominators of fractions.)Thus 2x^2 + 5x^3 cannot be combined into a single term.while 2x^2 + 5x^2 = (2+5)*x^2 = 7x^2
What must quantities have before they can be added or subtracted?
They must have compatible units of measure. For example, you cannot directly add a quantity measured in meters to a quantity measured in centimeters. If their units of measure are compatible but not identical, one can be converted to the other. On the other hand, there is no way to add a quantity in feet to a quantity in pounds, as those are incompatible units of measure. Additionally, if the quantities are fractions, they must also have the same denominators, also called sharing a common denominator.
