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Dina09din
@Dina09din
November 2021
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m11m
Verified answer
1)
(x-1)² +(2x+1)² = x² -2x+1 + 4x²+4x+1=5x²+2x+2
2)
(3-4y)(4y+3)=(3-4y)(3+4y)=3² - (4y)²=9-16y²
3)
(3-a)(9+3a+a²)=3³ - a³= 27 - a³
4)
(2a+1)³ = (2a)³ + 3*(2a)² *1 + 3*2a*1² + 1³=8a³ + 12a² +6a +1
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Answers & Comments
Verified answer
1)(x-1)² +(2x+1)² = x² -2x+1 + 4x²+4x+1=5x²+2x+2
2)
(3-4y)(4y+3)=(3-4y)(3+4y)=3² - (4y)²=9-16y²
3)
(3-a)(9+3a+a²)=3³ - a³= 27 - a³
4)
(2a+1)³ = (2a)³ + 3*(2a)² *1 + 3*2a*1² + 1³=8a³ + 12a² +6a +1