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Advocard [28]
3 years ago
13

Solve the equation. 8x2 – 4 = 28

Mathematics
2 answers:
Arte-miy333 [17]3 years ago
5 0
Its 2,-2............
Flura [38]3 years ago
4 0
Hello,

Your answer would be 2, -2.

8x^2 - 4 = 28

8x^2-4+4=28+4

8x^2 = 32

\frac{8x^2}{8}=  \frac{32}{8}  


x^2 = 4

x = +/4 

x = 2 or x = -2

2 , -2 would be the answer! :)


Mark Brainliest if this helped you :)
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10. Maddy has saved $55 from birthday money. She is earning $25 per week for babysitting her neighbors, which
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6 0
3 years ago
bob is twice as old as chuck, and susie is 10 years younger then bob if sum of their ages is 100 years how old is susie
Lina20 [59]

Answer:

The age of Susie is 34 years .

Step-by-step explanation:

Given as :

The statement is ,

Bob is twice as old as Chuck,

Susie is 10 years younger then Bob

The sum of age of Bob , Chuck , Susie = 100 years

Let The age of Bob = B years

Let The age of Chuck = C years

Let The age of Susie = S years

<u>Now, According to statement</u>

Age of Bob + Age of Chuck + Age of Susie = 100 years

i.e B + C + S = 100 years    ........1

<u>Again</u>

Age of Bob = 2 × age of Chuck

i.e B = 2 C                 .......2

<u>Again</u>

Age of Susie = Age of Bob - 10 years

i.e S = B - 10

∵  B = 2 C

So, S = 2 C - 10         ........3

<u>Solving equations 1 , 2 , 3</u>

Put the vale of eq 2 and eq 3 into eq 1

So, 2 C + C + (2 C - 10) = 100

Or, (2 C + C + 2 C ) - 10 = 100

Or, 5 C = 100 + 10

Or, 5 C = 110

∴    C = \dfrac{110}{5}

i.e  C = 22 years

So, The age of Chuck = C = 22 years

The age of Bob = 2 C = 2 × 22 = 44 years

The age of Susie = S = 2 C - 10

I.e The age of Susie = S = 2 × 22 - 10

Or, The age of Susie = S = 34 years

Hence, The age of Susie is 34 years . Answer

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3 years ago
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