Hayden01
contestada

Based on the graph below, what is the solution of the equation f(x) = g(x)? graph of function f of x equals negative x plus 0.25 and graph of function g of x equals x squared plus 3 multiplied by x plus 2
A) x = −3.5 and x = −0.5
B) x = −2 and x = −1
C) x = −3.5 and x = 0.25
D) x = −2 and x = 0.25

Just need to check, no explanation needed.

Respuesta :

ghanami
hello :
f(x) = -x+0.25
g(x) = x²+3x+2
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f(-3.5) = 3.75

g(-3.5) = 3.75


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f(-0.5) =0.75
g(-0.5) = 0.75
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conclusion : answer : A) x = −3.5 and x = −0.5 
calculista

Answer:

The answer is the option A

[tex]x=-3.5\ and\ x=-0.5[/tex]

Step-by-step explanation:

we have

[tex]f(x)=-x+0.25[/tex] ------> equation A

[tex]g(x)=x^{2} +3x+2[/tex] -----> equation B

[tex]f(x)=g(x)[/tex]

[tex]-x+0.25=x^{2} +3x+2[/tex]

[tex]x^{2} +3x+2+x-0.25=0[/tex]

[tex]x^{2} +4x+1.75=0[/tex]

Find the x-intercepts of the quadratic equation

Group terms that contain the same variable, and move the constant to the opposite side of the equation

[tex]x^{2} +4x=-1.75[/tex]

Complete the square. Remember to balance the equation by adding the same constants to each side

[tex]x^{2}+4x+4=-1.75+4[/tex]

[tex]x^{2}+4x+4=2.25[/tex]

Rewrite as perfect squares

[tex](x+2)^{2}=2.25[/tex]

Square root both sides

[tex]x+2=(+/-)1.5[/tex]

[tex]x=-2(+/-)1.5[/tex]

[tex]x=-2+1.5=-0.5[/tex]

[tex]x=-2-1.5=-3.5[/tex]

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