Camila and Evelyn work at a dry cleaners ironing shirts.Camila can iron 40 shirts per hour, and Evelyn can iron 20 shirts per ho
2 answers:
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Answer:
x = - 4 ± 2
Step-by-step explanation:
Given
f(x) = x² + 8x + 4
To find the zeros let f(x) = 0, that is
x² + 8x + 4 = 0 ( subtract 4 from both sides )
x² + 8x = - 4
To solve using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(4)x + 16 = - 4 + 16
(x + 4)² = 12 ( take the square root of both sides )
x + 4 = ± = ± 2
( subtract 4 from both sides )
x = - 4 ± 2
Thus the zeros are
x = - 4 - 2 and x = - 4 + 2
Answer:
The maximum error in the calculated area of the rectangle is
Step-by-step explanation:
The area of a rectangle with length and width
is
so the differential of <em>A</em> is
so
We know that each error is at most 0.1 cm, we have ,
. To find the maximum error in the calculated area of the rectangle we take
,
and
,
. This gives
Thus the maximum error in the calculated area of the rectangle is