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3 years ago

Consider the function f(x)=8-3x^2. Find the value of f(x) when x=3 and select the correct answer below.

Mathematics

2 answers:

Hatshy [7]3 years ago

4 0

F(3) = 8 - 3(3)^2
f(3) = 8 - 3(9)
f(3) = 8 - 27
f(3) = -19

masya89 [10]3 years ago

3 0

Yoooo the answer is A, -19. hope this helps, have an amazing day :)

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Step-by-step explanation:

We are given the coordinates of the midpoint of $\overline{\text{AB}}$ as M=(-5,-2).

We are also given the coordinates of A=(-3,4). The question requires us to calculate the coordinates of the other endpoint B.

Let (xb,yb) the coordinates of B. The coordinates of the midpoint can be calculated as follows:

$\displaystyle x_m=\frac{x_a+x_b}{2}$

$\displaystyle y_m=\frac{y_a+y_b}{2}$

We know xa=-3 and xm=-5. Solve the first equation for xb:

$2x_m=x_a+x_b\Rightarrow x_b=2x_m-x_a$

Substituting:

$x_b=2\cdot (-5)-(-3)=-10+3$

$x_b=-7$

We can solve the second equation for xb and get:

$y_b=2y_m-y_a$

Since ya=4 and ym=-2, then:

$y_b=2\cdot (-2)-(4)=-4-4$

$y_b=-8$

Thus, the coordinates of b are: B=(-7,-8)

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Step-by-step explanation:

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