Question

Give the values of a, b, and c from the general form of the equation (2x + 1)(x - 2) = 0.

a=2, b=-3, c= -2
a=2, b=5, C=-2
a=3, b=1, c= -1

Answer 1

`(2x+1)(x-2) = 0`

Multiplying the factors we obtain:

`2x\cdot x+2x\cdot (-2)+1\cdot x+1\cdot (-2)=0`

`2x^2-4x+x-2=0`

`2x^2-3x-2=0`

The general form of quadratic equation is:

`ax^2+bx+c=0`

Therefore,

`a=2`

`b=-3`

`c=-2`

The correct answer is the first one.