Question

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

–19
–9
1
10

Answer 1

@AlexandervonHumboldt2

Answer 2

first solve quadratic equation
you can use quadratic formula

Answer 3

need (x-10)(x+9) = 0 so 10

Answer 4

@Jhannybean Vieta ^_^

Answer 5

(-b+-sqrt(b^2-4ac))/2a

Answer 6

or you can find two number if you multiply them you should get -90 or if you add or subtract them you should get -1

Answer 7

do you wanna use quadratic formula ??
or find number <--- this one is easy
up to you
let me know

Answer 8

easy 1

Answer 9

okay can you find two number
if you multiply them you should get -90
and if you add or subtract them you should get -1