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

a+b=1

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form is equal to

in this problem we have

so

substitute in the formula

so

a=10, b=-9

a+b=10-9=1

Good evening ,

a+b=1

Step-by-step explanation:

For such equation which has the form : mx² + nx + p = 0

There is a rule in this course that tells as: a + b = -(n)/m

We have m=1 and n= (-1) then a+b= -(-1)/1 = 1/1 = 1.

:)

i think the answer is b. i hope i !