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fernando5
fernando5 fernando5
  • 19-05-2016
  • Mathematics
Answered

Put the equation in standard form and solve by factoring or using the quadratic formula.




1- x² - x + 3 = 2x -1




2- x² - 3x + 2 = x - 2




3- 10x² - 28x - 39 = 2x + 1

Verified Answer :

apologiabiology
apologiabiology apologiabiology
  • 19-05-2016

basically get into ax^2+bx+c=0 form

1.
x^2-x+3=2x-1
x^2-3x+4=0
(x-4)(x+1)=0
x-4=0
x=4
x+1=0
x=-1
x=4 or -1


2.
x^2-3x+2=x-2
x^2-4x+4=0
(x-2)(x-2)=0
x-2=0
x=2

3.
10x^2-28x-39=2x+1
10x^2-30x-40=0
10(x^2-3x-4)=0
10(x-4)(x+1)=0
x-4=0
x=4
x+1=0
x=-1
x=-1 or 4


1. x=-1 or 4
2. x=2
3. x=-1 or 4

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