In this page we have Practice questions for Factorization Class 8 Chapter 14 . Hope you like them and do not forget to like , social share
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Question 1
Factor the given expressions using identity:
(x+y)
2= x
2 +y
2 +2xy
(x-y)
2= x
2 +y
2 -2xy
x
2 –y
2 = (x-y) (x+y)
(i) p
2 + 6p + 9
(ii) 4z
2 – 4z + 1
(iii) 4p
4 + 9p
4 + 12p
2q
2
(iv) (a
4 - 8a
2b
2 + 16b
4) - 81
(v) 625 – x
2 – 2xy – y
2
Solution
(i) p2 + 6p + 9= (p+3)2
(ii) 4z2 – 4z + 1=(2z+1)2
(iii) 4p4 + 9p4 + 12p2q2=(2p2+ 3q2)2
(iv) (a4 - 8a2b2 + 16b4) - 81=(a2-4b2)2
(v) 625 – x2 – 2xy – y2= 625 -(x2+ 2xy + y2) =(25-x-y)(25+x+y)
Question 2
Divide as directed.
(i) 5(x + 1) (2x + 5) ÷ (2x + 5)
(ii) 39x(x + 5) (y - 2) ÷ 13x(y - 2)
(iii) 12pq (p + q) (q + r) (r + p) ÷ 6pq(q + r) (r + p)
(iv) 60(y - 4) (y
2 + 5y + 3) ÷ 5(y - 4)
(v) x(x + 1) (x - 2) (x + 3) ÷ x(x - 2)
Solution
(i) 5(x+1)
(ii) 3(x+5)
(iii) 2(p+q)
(iv) 5(y2 + 5y + 3)
(v) (x+1)(x+3)
Question 3
Factorize the expressions.
(i) px² + qx
(ii) 7x² + 21y²
(iii) 2x³ + 2xy² + 2xz²
(iv) ap² + bq² + bp² + aq²
(v) nm + n
2 + m + n
(vi) y (y - z) + 16 (y - z)
(vii) 5y² – 20y – 8z + 2yz
(viii) 10xy + 4x+ 5y + 2
(ix) 6xy - 4y + 6 - 9x
Solution
(i) x(px+q)
(ii) 7(x²+3y²)
(iii) 2x(x²+y²+z²)
(iv) (a+b)(p²+q²)
(v) (n+1)(m+n)
(vi) (y-z)(y+16)
(vii) 5y² – 20y – 8z + 2yz=5y(y-4) +2z(y-4)=(y-4)(5y+2z)
(viii)10xy + 4x+ 5y + 2=2x(5y+2) + 1(5y+2)=(2x+1)(5y+2)
(ix) 6xy - 4y + 6 - 9x= 6xy-9x- 4y+6= 3x(2y-3)-2(2y-3)= (3x-2)(2y-3)
Question 4
Factor completely using the formula:
(i) 576 - p
2 + 8pq - 16q
2
(ii) 25x
2 - (y + z)
2
(iii) 4p
2 - 4p - 3
(iv) 81 - x
2- y
2- 2xy
(v) 121 - x
2- y
2 - 2xy
Solution
(i) 576 - p2 + 8pq - 16q2= 242 -(p2 - 8pq + 16q2)=242 -(p-4q)2=(24-p+4q)(24+p-4q)
(ii) 25x2 - (y + z)2 =(5x)2-(y + z)2=(5x-y-z)(5x+y+z)
(iii) 4p2 - 4p - 3=4p2 - 6p+2p - 3=2p(2p-3) +1(2p-3)=(2p+1)(2p-3)
(iv) 81 - x2- y2- 2xy= 92 -(x2+ y2+ 2xy)=92-(x+y)2=(9-x-y)(9+x+y)
(v) 121 - x2- y2 - 2xy= 112 -(x2+ y2+ 2xy)=112-(x+y)2=(11-x-y)(11+x+y)
Question 5
Factorize the expressions:
(i) 4a
2- 12ab + 9b
2
(ii) 36p
2- 84pq + 49q
2
(iii) 4a
8- b
8
(iv) (z - 1)
2+ 2 (z-1) (2z+3) + (2z +3)
2
(v) p
2 -9q
2
Solution
(i) 4a2- 12ab + 9b2 =(2a-3b)2
(ii) 36p2- 84pq + 49q2=(6p-7q)2
(iii) 4a8- b8= (2a4)2 - (b4)2=(a4 - b4)(a4+ b4)
=(a2- b2)(a2 + b2)(a4+ b4)
(iv) (z - 1)2+ 2 (z-1) (2z+3) + (2z +3)2 =[(z-1)+(2z+3)]2=(3z+2)2
(v)p2 -9q2=(p-3q)(p+3q)
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