Question

1) determine o valor x:
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Answer 1

Teorema de Pitágoras

Sendo a a hipotenusa e b e c os catetos então

O quadrado da hipotenusa é igual a soma dos quadrados dos catetos

$\huge\boxed{\boxed{\boxed{\boxed{\mathsf{a^2=b^2+c^2}}}}}$

$\mathsf{25^2=20^2+x^2}\\\mathsf{x^2+400=625}\\\mathsf{x^2=625-400}\\\mathsf{x^2=225}\\\mathsf{x=\sqrt{225}}$

$\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=15}}}}}$