Question

can someone help me with how to do the rest of these plz
i'll post a picture

Answer 1

so just you need calcule the roots of this quadratic

there is the formula what you need just use it

what is your question here ?

Answer 2

do i do it as \[-b+\sqrt{b^2-4ac}\]
or
\[-b-\sqrt{b^2-4ac}\]

Answer 3

yes but the discriminant you have there given - so sqrt169 = ? hope you know

and now just substitute these dates inside the formula and calcule x_1 and x_2

Answer 4

that's all

hope helped understandably