Question

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

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.