jaiyaharoldjh jaiyaharoldjh
  • 04-02-2019
  • Mathematics
contestada


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

Respuesta :

ajprescott02
ajprescott02 ajprescott02
  • 04-02-2019
it can be factorised as
[tex] (x - 10)(x + 9)[/tex]
so the solutions are
x= 10 and x = -9

so the sum of the solutions is 10 -9 which is 1
Answer Link
erato erato
  • 19-07-2019

Answer:

Value of a+b is:

1

Step-by-step explanation:

For a equation

Ax²+Bx+C=0

if {a,b} are its solutions or equation has roots a and b

Then, sum of roots= -B/A  and product of roots=C/A

i.e. a+b= -B/A  and ab=C/A

Here, the equation is:

x² – x – 90 = 0

i.e. A=1,B= -1 and C= -90

then, a+b= -(-1)/1

i.e. a+b=1

Hence, value of a+b is:

1

Answer Link

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