calculate slope of tangent f(x) = sqrt2x+3 where x=2 use this method show all steps and calculations
calculate slope of tangent f(x) = sqrt2x+3 where x=2 use this method show all steps and calculations
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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calculate slope of tangent f(x) = sqrt2x+3 where x=2
use this method
show all steps and calculations

Transcribed Image Text:Ex. 2 Find the slope of the tangent to y=-x²+2x+6 for the point when x=5
@x= 5+h
y=(3+h)² + 2(5+h) +6
-25-10h-h² +10-2h+6
=-9-8h-h²
(5th, -9-8h-1²)
=lim X (-8-h), h+0
100
-8-h
Find 'y' coordinate
@ y = -(3) ² + 2(5) + 6
= -25+10+6
--9
: the point is (5,-9)
meon= Rim f(sth)-f(s)
5th-3
h+o
= fim - 9-8h-h² - (-a)
ho
3th-3
-8h-h²
- Rim
Ex 3. Determine the slope of the tangent to f(x)-
OP (3,4)
X = 3+h
f(31h)= 3+ha9
31h
= 12+h
3+h
.: the slope of
the tangent at
paint Pis -1, hvo
x=51h
f(son) (Sthis
= √9th
: the slope of
the tangent at 4-5
is thro
Mion"
2+9
at P(3,4)
X
nº fim +(3+h)-f(3)
3+h-3
12th -U
=-8, hvo
= Rum
ho
Ex 4. Find the slope of the tangent to f(x)=√x+4 atx=5
fls) = (344
= lim
2+0
lim
hao
= lim
em hinh
ma
h
(12th ~ - 4 (3+h) ) =
=h
3th
+
12th-12-4h.
3+h
h
- emm 9-1-9
nno
mtan= lim f(s+h)-f(3)
5th-5
Tain -3.
-3
31h
h(विक 13)
lor
htu k(rain 13)
2. the slope
of the tangent
when ys 513
-8, ho
ħ
9th +3
√4th 13
2-1, hvo
th₂o

Transcribed Image Text:A TANGENT is the straight line that BEST approximates a curve locally at a given point.
The slope at that point is defined as the slope of the tangent to the curve at that point.
Two problems in Calculus:
1) Slope of the tangent to the curve
2) Area under the curve
Ay
Recall:
AX
More importantly, the slope is the rate of change of y with regards to x. m= y₂-y₁
Ex 1: Determine the slope of the tangent to y=x² at P(2,4).
Meront Pa
tangent
at P
m
Pla fall
(2th, f(zh))
; the
slope of the
tangent at
Point Pis
4th, hvo
f(2+h)-(2)
2th 2
= (2+h) ³-4
21h-2
= 4+4h+h²-4
h
= 4h+h²
h
= w[4+h)
Tangent line
The slope of the tangent to a curve at a point, P, is the limiting slope of the secant PQ as the point Q slides
along the curve to point P.
le: the slope of the tangent is the limit of the slope of the secant as Q approaches Palong the curve.
Ql+ha+h)
P
mpg = 4th
Mton - Rim (41h)
=4
= 4+h,
hvo
Slope of a Tangent as a Limit
The slope of the tangent to the graph y=f(x) at point P(a.f(a)) is
Fle+A)-(e), if this limit exists.
= A
lim²
A
means os 'n' gets closer
to 0, 4th approaches 4,
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