NOTE MATH FORM 3 - ALGEBRAIC FORMULA
Transcript of NOTE MATH FORM 3 - ALGEBRAIC FORMULA
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ALGEBRAIC FORMULAE
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rL 2heightbreathLengthV
heightlenght2
1
)32(9
5 FC
Area of triangle=
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A = ½ x b x h
Subject of the formula
h
b
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Change the subject of the following formulae to the letter given in the brackets:Example 1:
27qp
pq 27
)(q
q p
27
Example 2:
yxw 5
wyx 5
)(x
x w
y5
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2
Example 3:
qp 2 )(q
q2 p
Example 4:
q p
2
nm 23 )(n
n2 m3
n m3
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2
Example 5:
272 qp
pq 272
)(q
q2 p
27
Example 6: yxw 54
wyx 54
)(x
x4 w
y5
q27
p x
4
5yw
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2
Example 7: 272 2 qp
pq 272 2
)(q
22q p
27
Example 8:
yxw 53
wyx 53
)(x
3 x w
y5
2q 27p
x 35yw
q2
27
p
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Exercise
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Exercise
1. Make k the subject of the following formulae
34k
m a.
b.
c.
d.
92 kx
pk 26
54 hkk
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ExercisePage 161Ex.7.2CNo. 1a,b,c,d,e,f,I,j,k
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ALGEBRAIC FORMULAE(Find the value of variable)
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Given that , find the value of V when s=6 and h=9
Example 1: 21
3V s h
21
3V s h
1
3V
136 9
3V
Solution:
6 9
2
X X
1 36 3V 108V
1
3
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Given that , find the value of A when b=12 and h=4
Example 2:
1
2A bh
1
2A bh
1
2A
112 4
2A
Solution:
12
4
X X
1 12 2A 24A
1
2
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Exercise:
1. Given that , find the value of I when P=2500, R=8 and T=2
2. Given that , find the value of M when a=72 and b=28
3. Given that , find the value of A when h=15, a=13 and b=21
4. Given that , find the value of y when m= -2 ,x=5 and c= -4
5. Given that , find the value of L when x= -3 and t = 4
100
PRTI
4 3M a b
1( )
2A h a b
y mx c
2 2L x tx
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Exercise:
Pg.163
Ex.7.2E
No. 1 - 4
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Exercise:
Pg.167
Subjective Questions
No. 1 - 8