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Andrej [43]
2 years ago
14

2(x + 4)2 = 20 solve by square roots

Mathematics
1 answer:
DanielleElmas [232]2 years ago
5 0

Answer:

x =  − 4  ±  √ 10,

Step-by-step explanation:

2(x + 4)² = 20

=> 2(x + 4)  (x + 4) = 20

=> 2x + 8 (x + 4) = 20

=> 2x² + 8x + 8x + 32 = 20

=> 2x² + 16x + 32 = 20

=> 2x² + 16x + 12 = 0

=> Now solve using the quadratic formula:

x =  − 4  ±  √ 10,

Radical form: − 4  ±  √ 10,

Decimal form: -0.84, -7.16

Hope this helps!

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I need help on 6 please! I’m pretty sure it’s 9, correct me if I’m wrong
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Solve the system of equations below x-2y=3 <br><br> 2y-3y=9
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First you solve 2y-3y=9.
2y - 3y = 9 \\ subtract \: 2y \: and \: 3y \\  - y = 9 \\  divide \: by \:  - 1 \\ y =  - 9
Now that you have y, then you substitute y into x-2y=3 to find X

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6 0
3 years ago
Put a digit in the gap, such that the answer is a whole number:
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Answer: The possible digits are 2,5 and 8

Step-by-step explanation:

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From the equation in the question, we are looking for a digit to put in the gap after 100 to make sure that when we solve the question, x will be a whole number.

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Inspecting the above, the only additions that are divisible by 3 are when the digit is; 2,5 and 8

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