Question

Which of the following are quadratic equation (x+3)(x-4)=0

Answer 1

(x+3)(x-4)=0

x(x-4)+3(x-4)=0

x²-4x+3x-12=0

x²-x-12=0

YES it is a quadratic equations....

Hope this helps you

Answer 2

Answer:

yes the given equation is a quadratic equation .

explanation:

quadratic equation is of the form: $ax^{2}$ + bx + c = 0

in the given equation (x+3)(x-4)

x(x-4) + 3(x-4).

($x^{2}$ - 4x)+ (3x - 12 )

$x^{2}$ - 4x + 3x - 12

$x^{2}$ - x - 12

hence , the above equation will be $x^{2}$ - x - 12 =0

hence, it is of the form of quadratic equation.