Question

(x+5)^2-x (x+3)

como faço?

Answer 1

${(x + 5)}^{2} - (x + 3)$
$(x + 5) \times (x + 5)$
${x}^{2} + 5x + 5x + 25 - (x + 3)$
${x}^{2} + 10x + 25 - (x + 3)$
${10}^{2} - 4 \times 1 \times 25$
$100 - 100$
$\sqrt{0} = 0$
$x = - 5$
${( - 5)}^{2} + 10 \times ( - 5) + 25 - (( - 5) + 3)$
$25 - 50 + 25 - 2$
$= - 2$