khalilah2000ortbfy
29.08.2019 •
Mathematics
George and bella are asked to solve −3x − 30 = 5x + 18. identify where one of them made an error.
george
bella
− 3x − 30 = 5x + 18
− 3x − 30 − 5x = 5x + 18 −5x
−8x − 30 = 18
− 8x − 30 + 30 = 18 + 30
−8x = 48
negative 8x over negative 8 equals 48 over negative 8
x = − 6
− 3x − 30 = 5x + 18
−3x − 30 − 3x = 5x + 18 − 3x
− 30 = 2x + 18
−30 − 18 = 2x + 18 −18
− 48= 2x
negative 48 over 2 equals 2x over 2
x=−24
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Ответ:
In the first step, instead of adding 3x for both sides, they subtract 3x instead.
Ответ:
A polynomial is the sum or difference of one or more monomials. A monomial is a variable, a constant, or the product of variables and constants. Each of these is a monomial, so it is a polynomial as well.