Gianna is going to throw a ball from the top floor of her middle school. when she throws the hall from 48 feet above the ground, the function h(t)=-16t^2+32t+48 models the height, h, of the ball above the ground as a function of time, t. find the times the ball will be 48 feet above the ground.

So, the times the ball will be 48 feet above the ground are t = 0 and t = 2.

Step-by-step explanation:

The height h of the ball is modeled by the following equation

The problem want you to find the times the ball will be 48 feet above the ground.

It is going to be when:

We can simplify by 16t. So

It means that

16t = 0

t = 0

or

t - 2 = 0

t = 2

So, the times the ball will be 48 feet above the ground are t = 0 and t = 2.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

answer:   14

step-by-step explanation:          

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