Question

which of the following are quadratic equations
A.x^3-5x^2+11x=0
B.x^2-x-2=0
C.x-5=0
D.2x^2+7=0
E.2x^2sqroot6x+8.9=0

Answer 1

A quadratic equation must have at least one term of second degree, and no terms with higher degree. A second degree term is either a single variable that is squared, such as y^2 or x^2, or a product of two variables to the first power, like xy.

Answer 2

It can't have square roots of variables, or variables in the denominator.

Answer 3

can u help me get the answers ?

Answer 4

Look at each choice.
A. There is a term x^3. That term is of degree 3, which is a higher degree than 2. That is not quadratic.

Answer 5

Now let's look at B.
There is a 2nd degree term, x^2. There are no higher degree terms. There is no variable in the denominator or in a square root. It is quadratic.

Answer 6

Now you tell me what you think of C.

Answer 7

its a quadratic

Answer 8

sorry its Not a quadratic D is a quadratic am i correct ?

Answer 9

Do you see a second degree term in choice C? In C, is there a product of variables or a variable squared?

Answer 10

the answers are B and D is that correct ?

Answer 11

Correct.

Answer 12

can u help me some more

Answer 13

assume that the area of the blue region is 100 units squared. which equation represents it
A.x^2+15x-50=0
B.x^2+15x+50=0
C.x^2-15x+50=0
D.x^2-15x-50=0

Answer 14

Is there a figure?