Question

simplify (2×+ 5) 2- ( 2× -5 )2
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Answer 1

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2 × 5 × 2 - 2 × -5 × 2

➪ 10 × -4 × -10

➪ 400

Answer 2

$\large\underline \text{Question :}$

$\mathsf{(2x+5)2 - (2x-5)2}$

$\large\underline \text{Solution:}$

$\implies\mathsf {(2x+5)2-(2x-5)2}$

$\implies \mathsf{(4x+10)-(4x-10)}$

$\implies \mathsf{4x+10-4x+10 }$

$\implies \mathsf{10+10}$

$\implies \mathsf{20}$