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Algebra problem collection (11..20) |
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problems 1..10
problems 21 to 27
11.
simplify:


12.
given | | x2 + y2 + xy = 9
x2 + z2 + xz = 16
y2 + z2 + yz = 25
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what is | | xy + xz + yz = ? |

13.
Calculate edge X of this square:


14.
Solve x in equation: 4x + 6x = 9x

15.
Given | |  |
| calculate a + b + c |

16.
if then calculate

17.
Given is a curve with equation:
x3 + y3 - x2 - y2 + 3xy = 0
Question:
calculate the derivative (tangent) in point (0,0).

18.
Calculate the area of triangle ABC:


19.
Solve x in the next equation:

20.
In the picture below the area of three triangles is given.
Calculate the area of the colored triangle.


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