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First of all we must factorise this:x² + 6x + 8 = 0(x+4)(x+2) = 0Now we make each bracket = 0 and solve for x.x+4 = 0 x+2 = 0x = -4 x = -2

The question tells us that the area of the circle is 49cm², therefore we are able to form the equation πr²=49 (where r = radius of the circle). We can now work out the radius of the ...

The quickest way would be to find determinants of the matrix; this way we can verify whether the matrix has unique (then we can directly calculate it) solution, infinite number of solutions or no solution...

Hexagon = 6 sides,Octagon = 8 sides,Rhombus = 4 sides,Trapezium = 4 sides. Therefore, the octagon has the most sides.

9x - 6x²+ 6 - 4x-6x² + 5x + 6