tfuefan tfuefan
  • 21-04-2019
  • Mathematics
contestada

Find the x-intercept(s) of y = 2x2 - 3x - 5.
A) -5
B) 2 1/2, -1
C) 3, -5
D) 5, -1

Respuesta :

gmany
gmany gmany
  • 21-04-2019

Answer:

[tex]\large\boxed{B)\ 2\frac{1}{2},\ -1}[/tex]

Step-by-step explanation:

x-intercepts are for y = 0.

We have the equation:

[tex]y=2x^2-3x-5[/tex]

Therefore

[tex]2x^2-3x-5=0\\\\2x^2+2x-5x-5=0\\\\2x(x+1)-5(x+1)=0\\\\(x+1)(2x-5)+0\iff x+1=0\ \vee\ 2x-5=0\\\\x+1=0\qquad\text{subtract 1 from both sides}\\\boxed{x=-1}\\\\2x-5=0\qquad\text{add 5 to both sides}\\2x=5\qquad\text{divide both sides by 2}\\\boxed{x=2\frac{1}{2}}[/tex]

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