how do you find the constant in a quadratic equation if you know A,B and one of the factors

Question

misty1212 · Answer

HI!!

misty1212 · Answer

you got an example?

hysusonic · Answer

no i took a test today and saw a question that asked this

tommynaut · Answer

If you know one of the factors, you can work out at what value of x (if your quadratic is in the form ax^2 + bx +c) would make your quadratic equal to 0.
For example, if you had x^2 - 1, that factors into (x-1)(x+1). If you knew (x-1), you would then know that at x = 1, your quadratic would equal 0.
The reason that's helpful is because you could set ax^2 + bx + c = 0, and you would know the values of a, b and x that satisfies the equation.
After that, you rearrange to find c.