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Factorise by ...

Question

Factorise by using formula:

$(0.7)^{2} - (0.3)^{2}$ is 0.4
If true then enter $1$ and if false then enter $0$

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Solution

$F a c t o r i z i n g {(0.7)}^{2} - (0.3)^{2}, = (0.7 + 0.3) (0.7 - 0.3) = (1) (0.4)$

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