Q Explain the marked step in the image to next step - Maths - Heron\s Formula

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Q Explain the marked step in the image to next step?

Ankita Agarwal · Accepted Answer

Dear Student,
20+10720+107-40×20+107-107×20+107-107=20+10720+107-40×20+107-107×20+107-107=107+20107-20×20×20=201072-202           a+ba-b=a2-b2
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Q.Explain the marked step in the image to next step?