Which of the following inequalities is not true?

Mathematics

1 answer:

Lemur [1.5K]3 years ago

4 0

Answer:

$| - 9| = |9|$

This is because modulus number will be always positive

Hope this is correct and helpful

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PLEASE HELP ME WITH IT.

scoundrel [369]

OK. I did it. Now let's see if I can go through it without
getting too complicated.

I think the key to the whole thing is this fact:

 A radius drawn perpendicular to a chord bisects the chord.

That tells us several things:

-- OM bisects AB.
 'M' is the midpoint of AB.
 AM is half of AB.

-- ON bisects AC.
'N' is the midpoint of AC.
 AN is half of AC.

-- Since AC is half of AB,
 AN is half of AM.
 a = b/2

Now look at the right triangle inside the rectangle.
'r' is the hypotenuse, so

 a² + b² = r²

But a = b/2, so (b/2)² + b² = r²

(b/2)² = b²/4 b²/4 + b² = r²

Multiply each side by 4: b² + 4b² = 4r²
 - - - - - - - - - - -
 0 + 5b² = 4r²
Repeat the
original equation: a² + b² = r²

Subtract the last
two equations: -a² + 4b² = 3r²

Add a² to each side: 4b² = a² + 3r² . <=== ! ! !

7 0

3 years ago

If f(x) = 2x2 + 1, what is f(x) when x = 3? a.1 b.7 c.13 d.19

prohojiy [21]

Answer:

The value of f(x) = $2x^2 + 1$ when x=3 is 19, hence the correct option is ‘d’.