3 years ago

Please help, this is worth a lot to me

1 answer:

8 0

27°

The angle which a chord subtends at the centre of a circle is twice the angle it subtends on the circumference.
i.e

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Let the number = x

12 + x = 3x - 32

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-2x = -44 Subtract 3x from both sides

x = 22 Divide by -2

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Flauer [41]

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Elanso [62]

Answer:

For $x^2 - 4 = 0$ , x = 2, or x = - 2.

Step-by-step explanation:

Here, the given expression is :

$x^2 - 4 = 0$

Now, using the ALGEBRAIC IDENTITY:

$a^2 - b^2 = (a-b)(a+b)$

Comparing this with the above expression, we get

$x^2 - 4 = 0 = x^2 - (2)^2 = 0\\\implies (x-2)(x+2) = 0$

⇒Either (x-2) = 0 , or ( x + 2) = 0

So, if ( x- 2) = 0 ⇒ x = 2

and if ( x + 2) = 0 ⇒ x = -2

Hence, for $x^2 - 4 = 0$ , x = 2, or x = - 2.

4 0

3 years ago