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3 years ago

For the function F defined by F(x)=x2−2x+4, find F(−2).

Mathematics

2 answers:

Kruka [31]3 years ago

4 0

Answer:

Step-by-step explanation:

x^2-2x+4 replace -2 for x

-2^2-2(-2)+4

4+4+4

MAVERICK [17]3 years ago

3 0

Answer:

F(-2) = 12

Step-by-step explanation:

F(-2) = (-2)²- 2(-2) + 4

= 4 - (-4) + 4

= 4 + 4 + 4

= 12

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Please Help!!

Genrish500 [490]

Given

$a\sqrt{x+b}+c=d$

we have

$\sqrt{x+b}=\dfrac{d-c}{a}$

Squaring both sides, we have

$x+b=\dfrac{(d-c)^2}{a^2}$

And finally

$x=\dfrac{(d-c)^2}{a^2}-b$

Note that, when we square both sides, we have to assume that

$\dfrac{d-c}{a}>0$

because we're assuming that this fraction equals a square root, which is positive.

So, if that fraction is positive you'll actually have roots: choose

$a=1,\ b=0,\ c=2,\ d=6$

and you'll have

$\sqrt{x}+2=6 \iff \sqrt{x}=4 \iff x=16$

Which is a valid solution. If, instead, the fraction is negative, you'll have extraneous roots: choose

$a=1,\ b=0,\ c=10,\ d=4$

and you'll have

$\sqrt{x}+10=4 \iff \sqrt{x}=-6$

Squaring both sides (and here's the mistake!!) you'd have

$x=36$

which is not a solution for the equation, if we plug it in we have

$\sqrt{x}+10=4 \implies \sqrt{36}+10=4 \implies 6+10=4$

Which is clearly false

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3 years ago

Convert 12.4 pounds to ounces?

raketka [301]

Answer:

198.4 ounches is the real answer

4 0

2 years ago

This one is about swings so yeaaa

Tpy6a [65]

Answer:

Ratio is 2:1

Step-by-step explanation:

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John bought a pair of basketball shoes for $70. The sales tax on the shoes was $5.60. Which represents the sales tax rate?

lisabon 2012 [21]

8%

$5.60 x 100/ 70 = 8

5 0

3 years ago

Read 2 more answers

Find the area of a floor which is covered by 1050 tiles.each tiles measuring 20 square meters

RoseWind [281]

Answer:

area of floor is

1050*20=21000

Step-by-step explanation:

mark me as brainliest

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3 years ago