Hi can any maths boffins assist a poor maths dunce with this one please?
I've had to do a level 3 maths course at work, but of a shock as sat GCSE maths in 1996 and only got a 'C'!
Anyway, this is one of the questions.
TAHIR HAS A REGULAR CYCLE TRAINING ROUTE THAT IS 60KM LONG. IF TAHIR CYCLES 3KMH SLOWER THAN HIS RACING SPEED,IT TAKES HIM 3 HOURS AND 20 MINUTES LONGER TO COMPLETE THE ROUTE.
A) WORK OUT TAHIR'S RACING SPEED. STATE IN WORDS WHAT ALGEBRAIC METHOD YOU ARE USING AT EACH STAGE.
B) CHECK YOUR ANSWER BY USING TWO FURTHER ALTERNATIVE METHODS FOR SOLVING QUADRATIC EQUATIONS.
C) EVALUATE ALL THREE METHODS FOR EFFICIENCY AND EFFECTIVENESS.
V^3 - 3V - 54 = 0
So how far have I got? Well the teacher gave us this quadratic equation above (still need to work out how I create an equation from the word problem, that's for another day! I've put it into the quadratic formula and factorised it and both have given me the answers V = 9 V = -6
I hope that's correct? Any idea how I can get the answers by 'completing the square'? Any other advise gratefully received.
Thank you