Ncert solutions

Ncert solutions

Grade 8

Algebraic Expressions and Identities | Exercise 9.2

Question 1

Q1) Find the product of the following pairs of monomials:

(i) 4, 7p

(ii) -4p, 7p

(iii) -4p, 7pq

(iv) 4p^3,\ -3p

(v) 4p, 0

Solution:

(i) 4\times7p=4\times7\times p=28p

(ii) -4p\times7p=\left(-4\times7\right)\times\left(p\times p\right)=-28p^2

(iii) -4p\times7pq=\left(-4\times7\right)\left(p\times pq\right)=-28p^2q

(iv) 4p^3\times-3p=\left(4\times-3\right)\left(p^3\times p\right)=-12p^4

(v) 4p\times0=\left(4\times0\right)\left(p\right)=0

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subject-cta

Question 1

Q1) Find the product of the following pairs of monomials:

(i) 4, 7p

(ii) -4p, 7p

(iii) -4p, 7pq

(iv) 4p^3,\ -3p

(v) 4p, 0

Solution:

(i) 4\times7p=4\times7\times p=28p

(ii) -4p\times7p=\left(-4\times7\right)\times\left(p\times p\right)=-28p^2

(iii) -4p\times7pq=\left(-4\times7\right)\left(p\times pq\right)=-28p^2q

(iv) 4p^3\times-3p=\left(4\times-3\right)\left(p^3\times p\right)=-12p^4

(v) 4p\times0=\left(4\times0\right)\left(p\right)=0

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