Check sibling questions

Ex 14.4, 15 - Find and correct the errors (a - 4) (a - 2) = a^2 - 8


Transcript

Ex 14.4, 15 Find & correct the errors in the following mathematical statements. (a – 4) (a – 2) = π‘Ž^2 – 8 Solving L.H.S : (a – 4) (a – 2) = a (a βˆ’ 2) βˆ’ 4 (a βˆ’ 2) = (a Γ— a) βˆ’ (a Γ— 2) βˆ’ (4 Γ— a) + (βˆ’4 Γ— βˆ’2) = π‘Ž^2 βˆ’ 2a βˆ’ 4a + 8 Taking a common = π‘Ž^2 + a (βˆ’2 βˆ’ 4) + 8 = π‘Ž^2 + a (βˆ’6) + 8 = π‘Ž^2 βˆ’ 6a + 8 ∴ (a βˆ’ 4) (a βˆ’ 2) = 𝒂^𝟐 βˆ’ 6a + 8 is the correct statement.

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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.