Search over 10,000 free study notes

We cannot factorise this so we shall use the quadratic formula instead.We need to substitute in the values for a, b, and c.ax² + bx + c = 0x² + 6x + 2 = 0a = 1, b=6, c=2Once substitu...

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 ...

To make crystals of copper chloride from copper carbonate andd dilute HCl, you will firstly need to add an excess of copper carbonate to the dilute HCl (keep adding until no more reacts). Next, take the s...

When an action potential reaches an axon terminal, the depolarisation from causes voltage-gated calcium ion channels in the plasma membrane of the synaptic knob to open. As there is a much higher concentr...