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3 years ago

A square field is 40m long.what is the lenght of wall which is constructed around it?

Mathematics

1 answer:

tensa zangetsu [6.8K]3 years ago

5 0

Answer:

The wall built around the field is 160 meters.

Step-by-step explanation:

Given that a square field is 40m long, to determine what is the length of wall which is constructed around it, the following calculation must be performed:

40 x 4 = X

160 = X

Therefore, the wall built around the field is 160 meters.

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In the third degree polynomial function f(x) =x^3 + 4x, why are 2i and -2i zeros?

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Answer:

We just need to evaluate and get f(2i)=0, f(-2i)=0.

Step-by-step explanation:

Since $i^2=-1$ , then $i^3=i^2i=-i$ , and we can apply this when we evaluate $f(x) =x^3 + 4x$ for 2i and -2i.

First we have:

$f(2i) =(2i)^3 + 4(2i)=2^3i^3+8i=8(-i)+8i=0$

Which shows that 2i is a zero of f(x).

Then we have:

$f(-2i) =(-2i)^3 + 4(-2i)=(-2)^3i^3-8i=-8(-i)-8i=8i-8i=0$

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A square field is 40m long.what is the lenght of wall which is constructed around it?​

A square field is 40m long.what is the lenght of wall which is constructed around it?