EXERCISE 9.3 1. Carry out the multiplication of the expressions in each of the following pairs. (1) 4p, 9+r (ii) ab, a-b (111) a + b, 7a²b2 (V) P9 + gr + rp, 0 (TV) a² - 9,4a 2. Com
Answers
Answer:
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Step-by-step explanation:
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Answer:
Ncert solutions
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Mathematics
Science
Chapters in NCERT Solutions - Mathematics , Class 8
Exercises in Algebraic Expressions and Identities
Question 1
Q1) Carry out the multiplication of the expressions in each of the following pairs:
(i) 4p,\ q+r4p, q+r
(ii) ab,\ a\ -\ bab, a − b
(iii) a+b,\ 7a^2b^2a+b, 7a
2
b
2
(iv) a^2-9,\ 4aa
2
−9, 4a
(v) pq+qr+rp, 0
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Solution:
(i) 4p\times\left(q+r\right)=4p\times q+4p\times r\ =\ 4pq+4pr4p×(q+r)=4p×q+4p×r = 4pq+4pr
(ii) ab\times\left(a-b\right)=ab\times a-ab\times b=a^2b-ab^2ab×(a−b)=ab×a−ab×b=a
2
b−ab
2
(iii) \left(a+b\right)\times7a^2b^2=a\times7a^2b^2+b\times7a^2b^2=7a^3b^2+7a^2b^3(a+b)×7a
2
b
2
=a×7a
2
b
2
+b×7a
2
b
2
=7a
3
b
2
+7a
2
b
3
(iv) \left(a^2-9\right)\times4a=a^2\times4a-4a\times9=4a^3-36a(a
2
−9)×4a=a
2
×4a−4a×9=4a
3
−36a
(v) (pq+qr+rp) x 0 = pq x 0 + qr x 0 + rp x 0
= 0 + 0 + 0 = 0