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Ex 9.4, 1 (iii) - Multiply (2.5l - 0.5m) and (2.5l + 0.5m) - Class 8


Transcript

Ex 9.4, 1 Multiply the binomials. (iii) (2.5𝑙 – 0.5𝑚) and (2.5𝑙 + 0.5𝑚) (2.5𝑙 – 0.5𝑚)(2.5𝑙 + 0.5𝑚) = 2.5𝑙(2.5𝑙+0.5𝑚)−0.5𝑚(2.5𝑙+0.5𝑚) = (2.5𝑙×2.5𝑙)+(2.5𝑙×0.5𝑚)−(0.5𝑚×2.5𝑙)−(0.5𝑚×0.5𝑚) = (25𝑙/10×25𝑙/10)+(25𝑙/10×5𝑚/10)−(5𝑚/10×25𝑙/10)−(5𝑚/10×5𝑚𝑙/10) = 625/100×(𝑙×𝑙)+125/100 (𝑙×𝑚)−(125/100)×(𝑚×𝑙)−(25/100)×(𝑚 × 𝑚) = 6.25𝑙^2+1.25𝑙𝑚−1.25𝑙𝑚−0.25𝑚^2 = 𝟔.𝟐𝟓𝒍^𝟐−𝟎.𝟐𝟓𝒎^𝟐

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.