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

a + b = 1

Step-by-step explanation:

We have the roots of ax²+bx+c = 0 as .

Sum of roots

Here equation is x²-x-90 = 0

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

Sum of roots = a + b

a + b = 1

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.