Question

1) Expand : (k + 4)3
2) Simplify : (x - 2y + 3)2 + (x + 2y - 3)2​

Answer 1

Step-by-step explanation:

$1) \: (k + 4)3 \\ = 3k + 12$

$2) \: (x - 2y + 3)2 + (x - 2y + 3)2 \\ = (x - 2y + 3)(2 + 2) \\ = (x - 2y + 3)(4) \\ = 4x - 8y + 12$

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