In maths class, we are hammered with expressions after expressions of quadratic equations. We are taught how to solve for its roots. We are taught all the necessary methods or mathematical techniques to handle quadratic equations.
But after all these, what is the purpose?
This is the question many students of maths studies ask.
Do we need this "quadratic" knowledge in working life?
See the diagrams and photos below. They will enlighten you.
The communication dish is parabolic in shape. Parabolic is the equivalent to quadratic mathematically. Engineers need to understand quadratic equation to design this beautiful profile.
This wok is designed using quadratic expression. With this, food can be fried to our liking!
Without quadratic equation, who knows how a wok would look like.
Here you see that eye-glass lens are constructed with curves matching that of the quadratic equation.
Light is thus controlled to give good image to our eyes.
Quadratic equations to the rescue, right?
Other examples are:
1) Distance travelled given by the quadratic equation s = ut + (1/2) a t2
2) Electrical characteristics of a MOSFET (Transistor device)
i = k [(Vg - Vt)VD - (1/2)Vd2]
So now do you still wonder why you study quadratic equations?
Maths do have a purpose in our daily life. Rest assure that you are studying maths for a good cause.