Slides in this set
· x² +2x-15
First of all, we have to find two numbers which multiply to give -15 and add
up to give 2.
The following are: +1 -15, -1 +15, +3 -5, -3 +5
You try all of them and see which ones you multiply together, gives you an
answer of -15 and which ones when you add, gives you +2.
The one which fits, is -3 and +5
You then put these values into brackets.
This would be your final answer. (This is just factorising and not solving).…read more
Solving using graphs!!!
· Quadratic equations can be solved using a
graph. Plot the points on a graph. Then you
check where the curve crosses the x-axis and
these would be your final solutions. You should
have two solutions.
· If there is a straight line also involved as well as
a curve, you check where the curve crosses the
line (at 2 places) and where it does cross the
line, would be your two solutions.…read more