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AlexFokin [52]
3 years ago
5

Simplify the expression and then substitute the given number for the variable. For expression 8a2+6b+9a2+9b2+3b, find the value

if a=2,b=−1.
Mathematics
1 answer:
Harlamova29_29 [7]3 years ago
8 0

Answer: 68

Step-by-step explanation:

Simplifying the expression:

= 8a² + 6b + 9a² + 9b² + 3b

Collect like terms

= 8a² + 9a² + 6b + 3b + 9b²

= 17a² + 9b + 9b²

We then substitute a=2,b=−1.

= 17a² + 9b + 9b²

= 17(2)² + 9(-1) + 9(-1)²

= 68 -9 + 9

= 68

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Find X and QT. The shape is a Rhombus
kompoz [17]

Answer:

See below ~

Step-by-step explanation:

Sides of a rhombus are equal.

⇒ QT = TS

⇒ x² - 4x - 10 = 6x + 14

⇒ x² - 10x - 24 = 0

⇒ x² + 2x - 12x - 24 = 0

⇒ x (x + 2) - 12 (x + 2) = 0

⇒ (x + 2)(x - 12) = 0

⇒ x = -2 or x = 12

Substitute both values and see which gives a positive value for QT :

<u>When x = -2</u> :

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<u>When x = 12</u> :

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  • QT = 144 - 48 - 10
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The 2 possible answers are :

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8 0
2 years ago
a bag is filled with 191 silver coins and 33 gold coins for what is the theoretical probability of pulling out a silver coin​
Alexxandr [17]

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3 0
3 years ago
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Brainlist for the right answer no link or bot 60 points only smart people
Arisa [49]

Answer:

1. -3

2. 0

3. .363636

4. Non-recurring Decimal, Recurring Decimal, Decimal Fraction

5. Going in order- irrational, rational, rational, irrational, integer, integer, irrational, integer, irrational, rational, rational.

6. 8

7. 12

8. 20

9. -5

10. False,  only the square roots of perfect square numbers are rational. So for example, the square root of 2 is not rational and the square root of 4 is rational.

11. No, only decimals that never end and never repeat are irrational. a decimal is rational if it can be written as a fraction or ratio of two numbers. for example: .3434343434343434

12. Yes,  9.5 can be written as a simple fraction like this: 9.5 = 192

13. 10,920

14. 40,000

15. 0.0702

16. .003

17. 18000000000 meters

18. 1- 2,000,000,000

18. 2- 3,800,000,000

19. 36, 49. or- So, the square root of 40 will be greater than 6 but less than 7.

20. You can just add the coefficients together. If the exponents are not equal, then you must make them equal by moving one of the decimals.

Step-by-step explanation:

Your welcome <3

4 0
3 years ago
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