Samacheer Kalvi 8th Maths Solutions Term 1 Chapter 3 Algebra Ex 3.2
Samacheer Kalvi 8th Maths Solutions Term 1 Chapter 3 Algebra Ex 3.2
Tamilnadu Samacheer Kalvi 8th Maths Solutions Term 1 Chapter 3 Algebra Ex 3.2
Question 1.
Fill in the blanks:
Question 5.
Divide
(i) 32y2 – 8yz by 2y
(ii) (4m2 n3 + 16m4 n2 – mn) by 2 mn
(iii) 10 (4x – 8y) by 5 (x – 2y)
(iv) 81 (94q2r3 + 2p3q3r2 – 5p2q2r2) by (3pqr)2
Solution:
Question 6.
Find Adirai’s percentage of marks who scored 25m3n2p out of 100m2np
Solution:
Total marks = 100 m2np
Adirai’s score = 25 m3n2p
Question 7.
Identify the error and correct them.
(i) 7y2 – y2 + 3y2 = 10y2
(ii) 6xy + 3xy = 9x2y2
(iii) m (4m – 3) = 4m2 – 3
(iv) (4n)2 – 2n + 3 = 4n2 – 2n + 3
(v) (x – 2) (x + 3) = x2 – 6
Solution:
(i) 7y2 – y2 + 3y2 = (7 – 1 + 3)y2 = (6 + 3)y2 = 9y2
(ii) 6xy + 3xy = (6 + 3)xy = 9xy
(iii) m (4m – 3) = m (4m) + m (-3) = 4m2 – 3m
(iv) (4n)2 – 2n + 3 = 16n2 – 2n + 3
(v) (x – 2) (x + 3) = x (x + 3) – 2 (x + 3) = x (x) + (x) × 3 + (-2) (x) + (-2) (3)
= x2 + 3x – 2x – 6 = x2 + x – 6