(2a-1)² expand the following
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3
Answer:
(2a-1)²
(a-b)² = a² + b² - 2ab
= (2a)² + (1)² - 2×2a×1
= 4a² + 1 - 4a
= 4a²- 4a + 1
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Answered by
1
Answer:
(a-b)²=a²+b²-2ab
(2a-1)²=(2a)²+1²-2×2a×1
=4a²+1-4a
=4a²-4a+1
0=(2a-1)(2a-1)
(2a-1)=0 (2a-1)=0
2a=1. 2a=1
a=1/2. a=1/2
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