Question

(10+2d) (10-2d) produtos notáveis

Answer 1

(10+2d) (10-2d)

$100 - 20d + 20d - 4d^2$

$100 - 4d^2$

Answer 2

Dada a propriedade:

$\mathsf{\left(a+b\right)\cdot \left(a-b\right)=a^2-b^2}$

= = = = =

Logo:

$\mathsf{=\left(10+2d\right)\cdot \left(10-2d\right)}\\\\\mathsf{=10^2-\left(2d\right)^2}\\\\\boxed{\mathsf{100-4d^2}}\: \: \checkmark$