Question

f(×)=×ao quadrado_4×+9

Answer 1

f(x)= x^2 - 4x + 9

0 = x^2 - 4x + 9

x^2 - 4x + 9 = 0

d = b^2 - 4.a.c

d = ( - 4)^2 - 4.1.9

d= 16 - 36

d= 20


x = - b + - \/d /2a

x1= - (-4)+ \/ - 20 /2a
x1= 4 +- \/ -20/2