Question

please answer my question​

Answer 1

Answer:

$1. \: {(x + 5)}^{2}$

$= {x}^{2} + {5}^{2} + 2(x)(5)$

$= {x}^{2} + 10 + 10x$

$= {x}^{2} + 10x + 10$

$2. \: {(x + y - 2)}^{2}$

$= {x}^{2} + {y}^{2} + {( - 2)}^{2} + 2(x)(y) + 2(y)( - 2) + 2( - 2)(x)$

$= {x}^{2} + {y}^{2} + 4 + 2xy - 4y - 4x$

Answer 2

Step-by-step explanation:

1) (x + 5)²

Using identity (a + b)² = a² + 2ab + b²

x² + 2(x)(5) + 5²

x² + 10x + 25

2) (x + y - 2)²

[x + y + (-2)]²

Using identity (a + b+ c)² = a² + b² + c² + 2ab + 2bc + 2ca

x² + y² + (-2)² + 2xy + 2y(-2) + 2(-2)x

x² + y² + 4 + 2xy - 4y - 4x

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