3. (x³ - 2x² ) - (x² - 6) = x³ - 3x² + 6
What is a polynomial ?
A polynomial is an alzebraic expression containing variables and constants and is separated by addition and subtraction.Multiplication and division do not separate the terms of a polynomial.The degree of a polynomial is can not be in fraction.
In the given question
(x³ - 2x² ) - (x² - 6)
= x³ - 2x² - x² + 6 :- (-2x² - 1x²) = -3x²
= x³ - 3x² + 6.
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4. The perimeter in feet the model is = ( 64x + 4 ) feet
What is perimeter ?
Perimeter is the sum of the lengths of all the sides of a figure.
In the given question dash line/lines indicated that the length of both of lines are same.Here we did not consider the length of the base of the triangle because it has been already considered in the rectangle.
2(6x - 4) + 2{(12x +3) +(14x + 3)}
=12x - 8 + 2{26x + 6}
=12x - 8 + 52x + 12
= ( 64x + 4 ) feet
Learn more about perimeter here :
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