Question

SENDO E= √x² - 6x + 9, Calcule o valor de E Para: x= 15,72

Answer 1

$E= \sqrt{15,72^{2} } -6(15,72)+9 \\ \\E= 15,72-94,32+9 \\ \\ E=69,6$

Boa tarde e bons estudos!

Answer 2

√(x² - 6x + 9)

x = 15,72

√(15,72² - 6 . 15,72 + 9)
√(247,1184 - 94,32 + 9)
√161,7984
12,72

Espero ter ajudado. Valeu!