Jawaban:
a.
Penjelasan dengan langkah-langkah:
(a+b-2c)²
= (a+b-2c)(a+b-2c)
= a × a + a × b + a × (-2c) + b × a + b × b + b × (-2c) + (-2c) × a + (-2c) × b + (-2c) × (-2c)
= a²+ab-2ac+ab+b²-2bc-2ac-2bc+4c²
= a²+2ab+b²-4ac-4bc+4c²
= a²+b²+4c²+2ab-4ac-4bc
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Jawaban:
a.
Penjelasan dengan langkah-langkah:
(a+b-2c)²
= (a+b-2c)(a+b-2c)
= a × a + a × b + a × (-2c) + b × a + b × b + b × (-2c) + (-2c) × a + (-2c) × b + (-2c) × (-2c)
= a²+ab-2ac+ab+b²-2bc-2ac-2bc+4c²
= a²+2ab+b²-4ac-4bc+4c²
= a²+b²+4c²+2ab-4ac-4bc