WAIT A MINUTE MY CALCULATOR MODEL NUMBER IS EL - 509W WITHOUT
THE S
http://sharp-world.com/products/calculators/sc_calculator/el-509w/index.html
Yeap, your calculator does not have the Solving equation
function.
To make it worst, i think your model does not come with the
function to find determinant of matrices, while your friend's
EL-509WS does.
I don't know if it is a good or bad news.
Don't rely too much on your calculator, next time you will not know
the manual way of finding 'x'. This applies not just for quadratic
equations, as well as other maths chapters, like complex numbers,
etc.
Learn the manual way, you will thank yourself for knowing how to
do the manual way of calculating next time
As for your test tmr, can just make use of the general equation
for solving for 'x'. Be very careful of the minus signs and
brackets, dun rush do one step at a time.
