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Sergeu [11.5K]
3 years ago
9

Ming throws a stone off a bridge into a river below.

Mathematics
2 answers:
AURORKA [14]3 years ago
6 0

Answer:

1 seconds after being thrown, the stone reaches its max height

Step-by-step explanation:

The parabolic (quadratic) equation is:

h(x)=-5(x-1)^2+45

Lets expand this in the form ax^2+bx+c, so we have:

h(x)=-5(x-1)^2+45\\h(x)=-5(x^2-2x+1)+45\\h(x)=-5x^2+10x-5+45\\h(x)=-5x^2+10x+40

We can say the values of a,b, and c, now to be:

a = -5

b = 10

c = 40

The number of seconds at which the max would occur is given by the point, x, at:

x=-\frac{b}{2a}

We know a and b, let's find the seconds, x,

x=-\frac{b}{2a}=-\frac{10}{2(-5)}=-\frac{10}{-10}=--1=1

Hence,

1 seconds after being thrown, the stone reach its max height

kifflom [539]3 years ago
3 0

Answer:

1 second

Step-by-step explanation:

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Step-by-step explanation:

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x

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(

x

+

6

)

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x

−

2

)

(

x

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+

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2

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x

−

1

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=

(

x

2

−

2

x

+

6

x

−

12

)

(

x

−

1

)

=

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x

2

+

4

x

−

12

)

(

x

−

1

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=

x

3

+

4

x

2

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12

x

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2

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4

x

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