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Lubov Fominskaja [6]
3 years ago
5

Make x the subject 4y = x ^2 +16 With workings please x

Mathematics
1 answer:
denis-greek [22]3 years ago
5 0
X^2 = 4y - 16
x =  +/- sqrt (4y - 16)
 x  = +/- 2 sqrt(y - 4)
You might be interested in
4/y+2 - 9/y-2 = 9/y^2-4
Evgesh-ka [11]
Going off the idea that this is 4/(y+2) - 9/(y-2) = 9/(y^2-4), let's first rewrite y^2-4 in the form of a^2-b^2, where a=y and b=2.
y/(y+2)-9/(y-2)=9/(y^2-2^2)
Now, use difference of squares: a^2-b^2=(a+b)(a-b)
4/(y+2)-9/(y-2)=9/((y+2)(y-2))
Multiply both sides by the Least Common Denominator: (y+2)(y-2)
4(y-2)-9(y+2)=9
Then keep on simplifying until you get your answer
-5y-26=9
-5y=9+26
-5y=35
y=35/-5
y=-7
Yay! Our answer is y=-7!
8 0
3 years ago
Read 2 more answers
Ben's age is currently twice of his sister, Emma. 8 years ago, Ben's age was 2 and a half times that of Emma's age at that time.
Yakvenalex [24]

Emma is now 24 years old then Ben would be 2E, or 48 years old.

<h3>What is a system of equations?</h3>

A system of equations is two or more equations that can be solved to get a unique solution. the power of the equation must be in one degree.

Let B and E be Ben's and Emma's current ages, respectively.

We have given that;

Ben's age is currently twice of his sister, Emma.

B = 2E

and

8 years ago, Ben's age was 2 and a half times that of Emma's age

B-8 = 2.5(E-8)      

We can substitute the value of B from the first equation into the last one

B-8 = 2.5(E-8)

(2E)-8 = 2.5(E-8)

2E-8 = 2.5E- 20

-0.5E = -12

E = 24

Thus, Emma is now 24 years old then Ben would be 2E, or 48 years old.

Learn more about equations here;

brainly.com/question/10413253

#SPJ1

8 0
2 years ago
Read 2 more answers
What is -6n+5=1? Thanks!
ivann1987 [24]
You subtract 5 to the other side so it'll read -6n=-4 then divide -6 to the other side and it'll be 2/3
6 0
3 years ago
Read 2 more answers
Please help me this is due tomorrow
bekas [8.4K]

Answer:

25

Step-by-step explanation:

7 0
3 years ago
Someone please help me
scZoUnD [109]

Answer:

Step-by-step explanation:

THe answer is C

4 0
3 years ago
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