X2 – 1x – 90 = 0 has solutions {a, b}. What is a + b?

Mathematics

1 answer:

s344n2d4d5 [400]3 years ago

3 0

Answer:

a + b =1

Step-by-step explanation:

Write the given quadratic as x^2 – 1x – 90 = 0. This factors into

(x - 10)(x + 9) = 0, and so the roots/solutions are {-9, 10}.

If we call -9 "a" and 10 "b," then the sum a + b is -9 + 10, or a + b =1.

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-----------------------------------------
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------------------ -
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