( y2 − 4y + 9) − (3y2 − 6y − 9)
What is the difference ?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

What is the period of the sinusoidal function ?