3 years ago

6x^2 - 21 = 9 solve for x

Mathematics

1 answer:

earnstyle [38]3 years ago

8 0

Answer:

$x=$ $\sqrt{5}$ , - $\sqrt{5}$

Step-by-step explanation:

Move everything to left side and set it equal to 0

Solve using quadratic formula

You might be interested in

Write 9− 16x⁴ as the product of two factors.

Marysya12 [62]

Answer:

The two factors will be $=(3+4x^2)\ and\ (3-4x^2)$

Step-by-step explanation:

We have given the equation $9-16x^4$

We know the algebraic equation $a^2-b^2=(a+b)(a-b)$

As $9-16x^4$ can be written as $3^2-(4x^2)^2$ , as square of 3 is 9 and square of $4x^2$ is $16x^4$

So $9-16x^4=3^2-(4x^2)^=(3+4x^2)(3-4x^2)$

So the two factors will be $=(3+4x^2)\ and\ (3-4x^2)$

6 0

3 years ago

Please answer this question

ICE Princess25 [194]

Answer:

A: 77

Step-by-step explanation:

360 - 109 - 137 - 37 = 77

3 0

3 years ago

Work out the size of the interior angle of a regular 18-sided polygon.

qaws [65]

Answer:

160°

Step-by-step explanation:

The formula below gives the measure of an interior angle of a regular polygon of n sides.

[(n - 2)180]/n

[(18 - 2)180]/18

16(10)

160

Answer: 160°

4 0

3 years ago

3(x-6) + 4 + 5x - 6 (use distributive property) please help asap!

Dmitry_Shevchenko [17]

Answer:

8x - 20

Step-by-step explanation:

3(x - 6) + 4 + 5x - 6 $\longmapsto$ Distribute 3 to (x - 6)

3(x) - 3(6) + 4 + 5x - 6

3x - 18 + 4 + 5x - 6

Simplify:

3x + 5x - 18 + 4 - 6

8x -18 - 2

8x - 20

-Chetan K

3 0

3 years ago

Read 2 more answers

Hello I really need help with this

Harman [31]

Answer:

7

Step-by-step explanation:

The sides are in proportion.

$\frac{AC}{DF} = \frac{AB}{DE}$
35/? = 20/4
35/? = 5
? = 35/5
? = 7

5 0

2 years ago

Read 2 more answers