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Q.
Factorise the expressions and divide them as directed.
(i) (y 2 + 7y + 10) ÷ (y + 5)
(ii) (m2 – 14m – 32) ÷ (m + 2)
(iii) (5p 2 – 25p + 20) ÷ (p – 1)
(iv) 4yz(z 2 + 6z – 16) ÷ 2y(z + 8)
(v) 5pq(p 2 – q 2 ) ÷ 2p(p + q)
(vi) 12xy(9x 2 – 16y 2 ) ÷ 4xy(3x + 4y)
(vii) 39y 3 (50y 2 – 98) ÷ 26y 2 (5y + 7)
see full answer
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Detailed Solution
In this question we simply divide the given expression and delete the same part and then we get the correct solution
(i) (y 2 + 7y + 10) ÷ (y + 5) :
so here, (y2 7y 10) = y2 2y 5y 10
= y ( y 2) 5 ( y 2)
= ( y 2) ( y 5)
Thus, we get
(y 2 + 7y + 10) ÷ (y + 5) = ( y 2) ( y 5) / ( y 5)
=( y 2)
(ii) (m2 14m 32) ÷ (m + 2) :
so here, (m2 14m 32) = m2 16m 2m 32
= m ( m 2) 16 ( m 2)
= ( m 2) ( m 16)
Thus, we get
(m2 14m 32) ÷ (m + 2) = ( m 2) ( m 16) / ( m 2)
= ( m 16)
(iii) (5p 2 25p 20) ÷ (p 1) :
so here, (5p 2 25p 20) = 5 ( p 2 5p 4)
= 5 ( p 2 p 4p 4)
= 5 [ p( p 1 ) 4 ( p 1)]
= 5 ( p 4) ( p 1)
Thus, we get
(5p 2 25p 20) ÷ (p 1) = 5 ( p 4) ( p 1) / ( p 1)
= 5 ( p 4)
(iv) 4yz(z 2 6z 16) ÷ 2y(z + 8) :
so here, 4yz(z 2 6z 16) = 4yz (z 2 2z 8z 16)
= 4yz ( z 2 2z 8z 10)
= 4yz [ z( z 2 ) 8 ( z 2)]
= 4yz ( z 2) ( z 8)
Thus, we get
4yz(z 2 6z 16) ÷ 2y(z + 8) = 4yz ( z 2) ( z 8) / 2y ( z 8)
= 2z ( z 2)
(v) 5pq(p 2 q 2 ) ÷ 2p(p q) :
By using this identity, a2 b2 = (a b)(a b)
so here, 5pq(p 2 q 2 ) = 5pq (p q) (p q)
Thus, we get
5pq(p 2 q 2 ) ÷ 2p(p q) = 5pq (p q) (p q) / 2p(p q)
= 5q (p q) /2
(vi) 12xy(9x 2 16y 2 ) ÷ 4xy(3x 4y) :
By using this identity, a2 b2 = (a b)(a b)
so here, 12xy(9x 2 16y 2 )= 12xy (3x 4y) (3x 4y)
Thus, we get
12xy(9x 2 16y 2 ) ÷ 4xy(3x 4y) = 12xy (3x 4y) (3x 4y) / 4xy(3x 4y)
= 3 (3x 4y)
(vii) 39y 3 (50y 2 98) ÷ 26y 2 (5y 7):
By using this identity, a2 b2 = (a b)(a b)
so here, 39y 3 (50y 2 – 98)= 3 13 2 y y y(5y 7)(5y 7)
26y 2 (5y 7) = 2 13 y y (5y 7)
Thus, we get
39y 3 (50y 2 98) ÷ 26y 2 (5y 7) = 3 13 2 y y y(5y 7)(5y 7)/ 13 y y (5y 7
= 3y (5y 7)
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