Which of the following are quadratic equations?
Select all correct answers.
$y=5x^2-6x$y=5x2−6x
$y=x^4+x^2+7$y=x4+x2+7
$y=1+x^3$y=1+x3
$y=4+8x+2x^2$y=4+8x+2x2
$y=x^2+2+\frac{6}{x}$y=x2+2+6x
$y=-7x^2+3$y=−7x2+3
Consider the parabola defined by the equation $y=x^2+4$y=x2+4.
Consider the parabola defined by the equation $y=-x^2+3$y=−x2+3.
Solve $x^2=25$x2=25 for $x$x.
Enter each solution on the same line, separated by a comma.
Solve simple quadratic equations using a range of strategies.