A-LEVEL•Mathematics•Quadratics•Question 2

Solution

🟢 Foundation · [3 marks] Find the values of the constant $k$ for which the equation $x^2 + kx + 9 = 0$ has equal roots.

timer1 min read•format_list_bulletedConcept 1 of 2•forumLesson Discussion

Equal roots means the discriminant is zero:

\begin{aligned} k^2 - 4(1)(9) &= 0 \\ k^2 &= 36 \\ k &= \pm 6 \end{aligned}

forum

menu_bookLesson...

Start discussion

keyboard_arrow_down

Discuss theoretical concepts, mathematical formulas, and architectural foundations.

No comments yet. Be the first to start the discussion!