The kinetic theory explains the effects of ? and ? on matter

The kinetic theory of matter tells us a lot about different phases of matter. This theory states that all matter is made of small particles that are in random motion and that have space between them.The attractive forces between them are assumed to be negligible because the particles are so far away from one another.

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complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15