Q1 of 53 Page 166

The difference (0.7)2 – (0.3)2 simplifies to



⇒ (0.7)2 – (0.3)2
⇒ (0.7 + 0.3)(0.7 – 0.3)


⇒ 1 × 0.4


⇒ 0.4

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