Please help me!!!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

Reika [66]2 years ago

7 0

First, we can factor out a 2 from the equation:

2(x²-4x-12)=0

Divide by 2 to simplify

x²-4x-12=0

Now to factor, we must find what multiplies to -12, but adds to get -4. I can tell you know, the numbers are -6 and 2 (Through time you will learn to get faster with factoring)

Now we set it up as so:

(x-6)(x+2) = 0

Now to find the solutions, you must find how to get each set of parenthesis equal to 0.
x-6=0
x=6 is a solution

x+2=0
x=-2 is a solution as well.

So your answer is x=6 and -2 (Answer Choice C)

I Hope this Helps!
-Sinnamin

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The height H of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 9

mariarad [96]

Answer:

The ball will be 84 feet above the ground 1.125 seconds and 4.5 seconds after launch.

Step-by-step explanation:

Statement is incorrect. Correct form is presented below:

The height $h(t)$ of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 90 feet per second is given by equation $h(t) = 3 +90\cdot t -16\cdot t^{2}$ , where $t$ is time in seconds. After how many seconds will the ball be 84 feet above the ground.

We equalize the kinematic formula to 84 feet and solve the resulting second-order polynomial by Quadratic Formula to determine the instants associated with such height:

$3+90\cdot t -16\cdot t^{2} = 84$