Question

Determine a solução real de cada uma das equações: a) 3x+7=x-3b) 4x-1=3x+/16

Answer 1

Resolução:

$\mathsf{a)}\\\\\mathsf{3x+7=x}\\\mathsf{3x-x=-7}\\\mathsf{2x=-7}\\\\\mathsf{x=-\dfrac{7}{2}}\\\\\\\boxed{\mathsf{S=\left\{x\in \mathbb{R}\:,\:x=-\dfrac{7}{2}\:\right\}}}\\\\\\\mathsf{b)}\\\\\mathsf{4x-1=3x+16}\\\mathsf{4x-3x=16+1}\\\mathsf{x=17}\\\\\\\boxed{\mathsf{S=\left\{x\in \mathbb{R}\:,\:x=17\right\}}}$