Question

what is the formula of :
1.
$(6x - 7)(6x + 7)$
2.
$(1.1m - 0.4)(1.1m + 0.4)$
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Answer 1

Answer:

a²-b² =(a+b)(a-b)

then , (6x - 7)(6x +7) ={ (6x)² - (7)² } = (36x² - 49)

and, (1.1m - 0.4)(1.1m + 0.4) = (1.1m)² - (0.4)² =( 1.21m² - 0.16)

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