Does the equation x^2 + 2x + 5 = 0 have any real roots?
This equation has no real roots, as when we test the equation with the formula b2 - 4ac, we get 22 -415 = 4 - 20 = -16. As this is negative we can be assured that this equation has no real roots.
SB
Related Maths A Level answers
All answers ▸Given f(x)=2x^3 - 2x^2 + 8x, find f'(x) and f"(x).
Differentiate xcos(x) with respect to x.
What is the equation of the tangent to the circle (x-5)^2+(y-3)^2=9 at the points of intersection of the circle with the line 2x-y-1=0
Find the equation of the tangent to the curve y = 2 ln(2e - x) at the point on the curve where x = e.