How to solve and the answer

C

Step-by-step explanation:

=-[(5x^3+3x^2-7x)+(3x^3-5x^2-2)-(-9x^2+8)]

=-[(5x^3+3x^2-7x)+(3x^3-5x^2-2)+9x^2-8]

=-[(5x^3+3x^3)+(3x^2-5x^2+9x^2)-7x-(2+8)]

=-[8x^3+7x^2-7x-10]

= -8x^3-7x^2+7x+10

2

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.