Select all of the following that are quadratic equations.

7 x^2 + 14 x = 0
x^3 - 3 x^2 + 1 = 0
5 x - 7 = 0
x2 + 3 x -5 = 0
x - 5 = 9 x + 7
x^2 - x = 3 x + 7

Question

Select all of the following that are quadratic equations.


7 x^2 + 14 x = 0
x^3 - 3 x^2 + 1 = 0
5 x - 7 = 0 
x2 + 3 x -5 = 0
x - 5 = 9 x + 7
x^2 - x = 3 x + 7

conqueror · Answer

Good answer below

solomonzelman · Answer

` Quadratic ` has the biggest exponent of 2 (next to the variable) . (roughly speaking)

anonymous · Answer

Any polynomial having the highest degree as 2 s quadratic , now you tell me what is the answer

anonymous · Answer

Instead of us telling

solomonzelman · Answer

Degree is tyhe sum of exponents. @No.name

anonymous · Answer

sum of exponents? what

solomonzelman · Answer

Yes, degree is actually the sum of the exponents in the polynomial.

Quadratic will usually look like
` ax² + bx + c = 0 `  
or `ax² + bx = 0 `   (where c=0 )

precal · Answer

Also, it is not a quadratic if you have a variable to a degree higher than 2.  For example x^3 is cubic and not quadratic.  So therefore the highest degree is the classification of the polynomial.  ie x^2 +x^3  is a cubic not a quadratic.