Answer:
Step-by-step explanation:
a)
![f(1)=-1^3+2*1^2+1-2=-1+2+1-2=0\\\\](https://tex.z-dn.net/?f=f%281%29%3D-1%5E3%2B2%2A1%5E2%2B1-2%3D-1%2B2%2B1-2%3D0%5C%5C%5C%5C)
b)
Rationnel roots are divisor of -2: -1,1,-2,2
![f(-1)=-(-1)^3+2*(-1)^2+(-1)-2=1+2-1-2=0\\\\\begin{array}{c|cccc}&x^3&x^2&x&1\\---&---&---&---&---\\&-1&2&1&-2\\x=1&&-1&1&2\\&-1&1&2&0\\\\x=-1&&1&-2\\&-1&2&0\\---&---&---&---&---\\\end {array}\\\\\\f(x)=-x^3+2x^2+x-2=(x-1)(x+1)(-x+2)\\\\](https://tex.z-dn.net/?f=f%28-1%29%3D-%28-1%29%5E3%2B2%2A%28-1%29%5E2%2B%28-1%29-2%3D1%2B2-1-2%3D0%5C%5C%5C%5C%5Cbegin%7Barray%7D%7Bc%7Ccccc%7D%26x%5E3%26x%5E2%26x%261%5C%5C---%26---%26---%26---%26---%5C%5C%26-1%262%261%26-2%5C%5Cx%3D1%26%26-1%261%262%5C%5C%26-1%261%262%260%5C%5C%5C%5Cx%3D-1%26%261%26-2%5C%5C%26-1%262%260%5C%5C---%26---%26---%26---%26---%5C%5C%5Cend%20%7Barray%7D%5C%5C%5C%5C%5C%5Cf%28x%29%3D-x%5E3%2B2x%5E2%2Bx-2%3D%28x-1%29%28x%2B1%29%28-x%2B2%29%5C%5C%5C%5C)
c) see picture
Answer:
Part A=2cm²
Part B =The area of each triangle will be 1cm²
Explanation:
Part A
Area of parallelogram similar to that of rectangle =length x width
Area of the parallelogram= 3 x 2/3
= 2cm²
Part B
If you draw a line from A to C or B to D the form 2 triangles
Area of a triangle =1/2 x base x Height
=1/2 x 3 x 2/3
= 6/6
= 1cm²
Therefore both triangles are 1cm²
Sorry for not explaining at first I submitted the answer by accident
Answer:
The answer is A
Step-by-step explanation:
The Area of the Triangle is A = 135
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