63luckychowdhury 63luckychowdhury

26-02-2020
Mathematics

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10. Explain the Error: Marco wrote the expression (2x - 7y)2 = 4x2 - 49y2. Explain
and correct his error.

HELP ASAP

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ahuchogufamily ahuchogufamily

26-02-2020

(2x-7y)(2x-7y)= 4x2-14xy-14xy+49y2

The answer is 4x2-27xy+49y2
He’s error was rather than expanding he squared

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