Question

expand the following using indentities
1- (5-y)²
2-(308)²
3-(x+2y)²

​

Answer 1

1. 25+y²-10y

2. (300+8)²

90000+64+4800

3.x²+4y²+4xy

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Answer 2

$\bold{\underline{\underline{Part\:1→}}}$

$\sf\color{blue}{→(5-y)^2}$

$\sf\color{blue}{→(5)^2+(y)^2-2(5)(y)}$

$\sf\color{blue}{→25+y^2-10y}$

$\sf\color{blue}{→y^-10y+25}$

$\bold{\underline{\underline{Part\:2→}}}$

$\sf\pink{→(308)^2}$

$\sf\pink{→(307+1)^2}$

$\sf\pink{→(307)^2+2(307)(1)+(1)^2}$

$\sf\pink{→94249+614+1}$

$\sf\pink{→94863+1}$

$\sf\pink{→94864}$

$\bold{\underline{\underline{Part\:3→}}}$

$\sf\purple{→(x+2y)^2}$

$\sf\purple{→(x)^2+(2y)^2+2(2y)(x)}$

$\sf\purple{→x^2+4y^2+4xy}$

HOPE IT HELPS.