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(b - 4)(a - 2) = a 2 - 8 Since (a - 4) (a - 2) = a(a - 2) - 4(a - 2) = a 2 - 2a - 4a + 8 = a 2 - 6a + 8 ∴ The correct statement is (a - 4)(a - 2) = a 2 - 6a + 8

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Factorisation

Short Answer Type

131.
Find and correct the errors in the following mathematical statement.

(a - 4) (a -2) = a² - 8

(b - 4)(a - 2) = a² - 8

Since   (a - 4) (a - 2) = a(a - 2) - 4(a - 2)

                              = a² - 2a - 4a + 8

                              = a² - 6a + 8

∴ The correct statement is
(a - 4)(a - 2) = a² - 6a + 8

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