How do you write 4.279E-4 in standard form?

Mathematics

2 answers:

vampirchik [111]2 years ago

7 0

Answer:

0.0004279 in decimal form

Step-by-step explanation:

alex41 [277]2 years ago

3 0

Answer:

4279/10000000

Step-by-step explanation:

Multiply and divide by 10 for every number after the decimal point. There are 7 digits to the right of the decimal point, therefore multiply and divide by 10000000.

'Hope this helps :)'

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PolarNik [594]

Answer:
The second choice is the correct one

Explanation:
(2x+3)^2 + 8(2x+3) + 11 = 0
To use the u substitution, we will assume that:
2x + 3 = u

Substitute with this in the given expression, we will get:
u^2 + 8u + 11 = 0

The general form of the second degree equation is:
ax^2 + bx + c = 0

Comparing the expression we reached with the general one, we will find that:
a = 1
b = 8
c = 11

The roots can be found using the rule found in the attached picture.
This means that, for the given expression:
u = -4 ± √5

Now, we have:
u = 2x+3
This means that:
at u = -4 + √5
2x + 3 = -4 + √5
2x = -7 + √5
x = (-7 + √5) / 2

at u = -4 - √5
2x + 3 = -4 - √5
2x = -7 - √5
x = (-7 - √5) / 2

This means that, for the given expression:
x = (-7 ± √5 ) / 2

Hope this helps :)