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SVEN [57.7K]
3 years ago
12

Estimate: √20 A. 4 B. 5 C. 6 D. 7

Mathematics
2 answers:
Alika [10]3 years ago
5 0
\sqrt{20}=\sqrt{4*5}=2 \sqrt{5}
\sqrt{5} is around 2, and 2 * 2 = 4, so the estimate is about 4.
Lina20 [59]3 years ago
3 0
A<b<c
b is the square root of 20
if we square everybody
a²<b²<c²
if we say that b²=20 then

a²<20<c²
find a and c

2^2=4
3^2=9
4^2=16
5^2=25

16<20<25
sqrt both sides
4<√20<5

somewhere between 4 and 5
closer to 16 than 25

A

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Solve the quadratic equation 4x2 − 121 = 0. Verify your answer using a difference-of-squares factoring method.
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Answer:

Option d) is correct

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Step-by-step explanation:

Given quadratic equation is 4x^2-121=0

To write the given quadratic equation by using a difference-of-squares factoring method:

4x^2-121=0

The above equation can be written as

4x^2-11^2=0

(2x)^2-11^2=0

The above equation is in the form of difference-of-squares

Therefore the given quadratic equation can be written in the form of difference-of-squares

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(2x+11)(2x-11)=0 (which is in the form a^2-b^2=(a+b)(a-b) )

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x=\frac{-11}{2}    or   x=\frac{11}{2}

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