Question

3-Qual o valor da expressão algébrica Vb2 - 4ac
para a = 2, b = -5 e c = 2?
a) 1
b) 2.
c) 3
d) 4​

Answer 1

$\Large\boxed{\begin{array}{l}\sf\sqrt{b^2-4ac}~~\bigg]^{a=2~b=-5~c=2}=\sqrt{(-5)^2-4\cdot2\cdot2}\\\\\sf\sqrt{b^2-4ac}~\bigg]^{a=2~b=-5~c=2}=\sqrt{25-16}\\\\\sf\sqrt{b^2-4ac}~\bigg]^{a=2~b=-5~c=2}=\sqrt{9}\\\\\sf\sqrt{b^2-4ac}~\bigg]^{a=2~b=-5~c=2}=3\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~c}}}}\end{array}}$