in quadratic equation it must be in standard form, ax^2 + bx + c = 0.
Jenny is five years older than Marian. In three years, the product of her age and Marian's age five years ago will be 90 years. Find their present age.
Solution:
Let x= Marian's present age
x + 5= Jenny's present age
The working
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No. Sometimes they are both extraneous.
x2
If you mean 3x2+4x-2 = 0 then it can be solved by means of the quadratic equation formulla
Many real life physics problems are parabolic in nature. Parabolas can be shown as a quadratic equation. If you have two variables then usually you can use the equation to find the best solution to a problem. Also, it is a beginning in the world of mathematical optimization. Some equations use more than two variables and require the technique used to solve quadratics to solve them. I just ran an optimization of 128 variables. To understand the parameters I needed to set I had to understand quadratics.
The cheapest monetary way to acquire the answers to the questions in that algebra textbook is to work out them yourself. Textbooks usually provide instructions on how to solve the equations in the problem set and often solve a few example problems as well.