Question

(factorisation)evaluate 67×73

Answer 1

= 67×73
= (70-3)(70+3) [(a+b)(a-b) = a² - b² ]
= 70² - 3²
= 4900 - 9
= 4891

Answer 2

(factorisation)evaluate 67×73

solution:

= 67×73

=(70-3)(70+3) {therefore (a+b)(a-b)=a²-b²}

=70²-3²

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