Question

Identify which equation is a quadratic equation.

y = 3x + 4

y + x2 = (x − 2)(x + 7)

y = −4x(x − 4) + 2x

y + 3 = (x + 12)(x2 + 2)

Answer 1

so i think 3rd but can you tell me why ?

Answer 2

no, how do you think its 3?

Answer 3

well the 3rd one

Answer 4

so if you make the calcule there will be x^2 + ... =0 what sign that is quadratic equation

ok ?

Answer 5

yess

Answer 6

good luck

bye

Answer 7

The first one is a line

Answer 8

2. y + x2 = (x − 2)(x + 7)
y+x^2=x^2+5x-14
y=5x-14
That is linear also.

Answer 9

y = −4x(x − 4) + 2x
y=-4x^2+16x+2x
y=-4x^2+18x
That is quadratic because the highest exponent is 2

Answer 10

y + 3 = (x + 12)(x2 + 2)
y+3=x^3+12x^2+2x+24
That one is cubic because the highest exponent is 3

Answer 11

thank you guys