which of the following is a quadratic equation in one variable. a.7x^2-15=32x b. x^2+y+9=0 c.3x+2y=8. d. 5x -15=0

a. 7x^2-15=32x

Step-by-step explanation:

a standard form quadratic equation is written as ax^2+bx+c=0

7x^2-15=32x can be rewritten into 7x^2-32x-15=0 by subtracting 32x on both sides.

options b and c don't work  because they include another variable, y

option d is a linear equation, not a quadratic

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

false

step-by-step explanation:

false : it can not go to 9 the highest that part can go is 7

here is your proof