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Ex 9.4, 3 (i) - Chapter 9 Class 8 Algebraic Expressions and Identities
Last updated at March 16, 2023 by Teachoo
Ex 9.4
Ex 9.4, 1 (i)
Ex 9.4, 1 (ii)
Ex 9.4, 1 (iii) Important
Ex 9.4, 1 (iv)
Ex 9.4, 1 (v) Important
Ex 9.4, 1 (vi) Important
Ex 9.4, 2 (i)
Ex 9.4, 2 (ii) Important
Ex 9.4, 2 (iii)
Ex 9.4, 2 (iv) Important
Ex 9.4, 3 (i) You are here
Ex 9.4, 3 (ii)
Ex 9.4, 3 (iii) Important
Ex 9.4, 3 (iv)
Ex 9.4, 3 (v) Important
Ex 9.4, 3 (vi)
Ex 9.4, 3 (vii) Important
Ex 9.4, 3 (viii)
Transcript
Ex 9.4, 3 Simplify. (i) (𝑥^2−5) (𝑥+5)+25 Here, there are 2 expressions: 1st expression = (𝑥^2−5) (𝑥+5) 2nd expression = 25 Solving 1st expression (𝑥^2−5) (𝑥+5) = 𝑥^2 (𝑥+5)−5(𝑥+5) = (𝑥^2×𝑥)+(𝑥^2×5)−(−5×𝑥)−(5×5) = 𝑥^3+5𝑥^2−5𝑥−25 Now, our expression is (𝑥^2−5) (𝑥+5)+25 = 𝑥^3+5𝑥^2−5𝑥−25+25 = 𝒙^𝟑+𝟓𝒙^𝟐−𝟓𝒙
