Question

qual a resolucao por favor$x^{2} -18x+45=0$

Answer 1

x² - 18x + 45 =0
Δ= b² - 4 ac
Δ= (-18) ² - 4 . 1.45
Δ= 324 - 180 
Δ= 144

x= -b +/- √Δ / 2a
x= -(-18) +/- √144 / 2.1
x= 18 + 12 / 2
x'= 30 / 2
x'= 15

x''= 18 - 12 /2
x''= 6/2
x''= 3