Question

The equation x2 – 1x – 90 = 0 has solutions {a, b}. What is a + b?

Answer 1

90=0 so therefore the answer is right there 100%

Answer 2

Answer:

a + b = 1

Step-by-step explanation:

We have the roots of ax²+bx+c = 0 as $\frac{-b\pm \sqrt{b^2-4ac}}{2a}$.

Sum of roots $=\frac{-b+\sqrt{b^2-4ac}}{2a}+\frac{-b-\sqrt{b^2-4ac}}{2a}=-\frac{b}{a}$

Here equation is x²-x-90 = 0

a = 1, b = -1 and c = -90

Sum of roots = a + b $=-\frac{b}{a}=-\frac{-1}{1}=1$

a + b = 1