Question

(5ab-4cd)². expand the following​

Answer 1

${(5ab - 4cd)}^{2}$

$= {(5ab)}^{2} + {(4cd)}^{2} - 2 \times (5ab) \times (4cd)$

$= 25 {a}^{2} {b}^{2} + 16 {c}^{2} {d}^{2} - 40abcd$

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Answer 2

Answer:

(a-b)²=a²+b²-2ab

Step-by-step explanation:

(5ab)²+(4cd)²-2(5ab)(4cd)

25a²b²+16c²d²-40abcd

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