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3 years ago

Which of the following expressions is equivalent to 9x2 - 4 ?

Mathematics

1 answer:

navik [9.2K]3 years ago

3 0

If your teacher wants you to factor, then use the difference of squares rule

9x^2 - 4

(3x)^2 - 2^2

(3x-2)(3x+2)

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If x and x+ 10 are a pair of adjacent angle find them

ikadub [295]

Answer:

85° and 95°

Step-by-step explanation:

Given that , x and x + 10 are a pair of angles .

If they will be pair of angles on the same line , then their sum will be 180° .

=> x + x + 10° = 180°

=> 2x = 180° -10°

=> 2x = 170°

=> x = 170°/2

=> x = 85° .

<h3>Hence the two angles are 85° and 95° .</h3>

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3 years ago

Solve for x: 8^x = (2^7)(4^9).

8_murik_8 [283]

Answer:

C. x = 25/3

Step-by-step explanation:

7 0

2 years ago

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<img src="https://tex.z-dn.net/?f=%5Cleft%20%5C%7B%20%7B%7Ba%5E2%20-2a-b%5E2%3D0%7D%20%5Catop%20%7B2b%2B2ab%3D0%7D%7D%20%5Cright

oksian1 [2.3K]

Given :-

a² - 2a - b² = 0
2b + 2ab = 0

To find :-

Value of a and b .

Solution :-

Taking second equation:-

2b + 2ab = 0
2b ( 1 + a ) = 0
2b = 0 or (1+a) = 0
b = 0 , a = -1

Substitute in first equation :-

a² - 2a - b² = 0

When b = 0 ,

a² - 2a - 0² = 0
a² - a = 0
a( a -1) =0
a = 0 , 1

When a = -1 ,

(-1)² - 2*(-1) - b² = 0
1 + 2 - b² = 0
b² = 3
b = ±√3

Answer :-

a = 0,1 ; b = 0
a = -1 , b = ±√3

8 0

2 years ago

Finding value of x. PQR P- 2x° 3 3 3

Mrrafil [7]

$\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}$

Actually Welcome to the Concept of the Equilateral Triangles.

Since, we know that, all the sides of a triangle are equal, hence it is a Equilateral triangle.

Equilateral triangle has one all angles equal to 60°.

so, major angle P = 60°

hence, 2x=60°

===> x = 30°

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2 years ago

HELP PLSS Write the percent as a fraction and as a decimal. 3/15%

sdas [7]

Answer:

0.2% and 1/5%

Step-by-step explanation:

Hope this helps

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2 years ago

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