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Given functions f(x) = 2x2 − (3x)/(4) and g(x) = (x+1)/(1-2x), find the values of x for which g(x−1) = f(1) and f(x+1) = 0.

Mathematics

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2 parts
i

1514\frac{15}{14}

ii

−1,−58-1, -\frac{5}{8}

Step-by-step solution

5 steps

Here are the values of xx for the given conditions.

Given functions:
f(x)=2x2−3x4f(x) = 2x^2 - \frac{3x}{4}
g(x)=x+11−2xg(x) = \frac{x+1}{1-2x}

Part i· 3 steps

Find the values of xx for which g(x−1)=f(1)g(x-1) = f(1).

  1. Calculate f(1)f(1).

    Substitute x=1x=1 into f(x)f(x):

    f(1)=2(1)2−3(1)4=2−34=84−34=54f(1) = 2(1)^2 - \frac{3(1)}{4} = 2 - \frac{3}{4} = \frac{8}{4} - \frac{3}{4} = \frac{5}{4}
  2. Calculate g(x−1)g(x-1).

    Substitute x−1x-1 into g(x)g(x):

    g(x−1)=(x−1)+11−2(x−1)=x1−2x+2=x3−2xg(x-1) = \frac{(x-1)+1}{1-2(x-1)} = \frac{x}{1-2x+2} = \frac{x}{3-2x}
  3. Set g(x−1)=f(1)g(x-1) = f(1) and solve for xx.

    x3−2x=54\frac{x}{3-2x} = \frac{5}{4}

    Cross-multiply:

    4x=5(3−2x)4x = 5(3-2x) 4x=15−10x4x = 15 - 10x

    Add 10x10x to both sides:

    4x+10x=154x + 10x = 15 14x=1514x = 15

    Divide by 14:

    x=1514x = \frac{15}{14}

    The value of xx for g(x−1)=f(1)g(x-1) = f(1) is 1514\boxed{\frac{15}{14}}.

Part ii

−1,−58-1, -\frac{5}{8}

Find the values of xx for which f(x+1)=0f(x+1) = 0.

  1. Calculate f(x+1)f(x+1).

    Substitute x+1x+1 into f(x)f(x):

    f(x+1)=2(x+1)2−3(x+1)4f(x+1) = 2(x+1)^2 - \frac{3(x+1)}{4}
  2. Set f(x+1)=0f(x+1) = 0 and solve for xx.

    2(x+1)2−3(x+1)4=02(x+1)^2 - \frac{3(x+1)}{4} = 0

    Multiply the entire equation by 4 to eliminate the fraction:

    8(x+1)2−3(x+1)=08(x+1)^2 - 3(x+1) = 0

    Factor out the common term (x+1)(x+1):

    (x+1)[8(x+1)−3]=0(x+1)[8(x+1) - 3] = 0

    Simplify the expression inside the square brackets:

    (x+1)[8x+8−3]=0(x+1)[8x + 8 - 3] = 0 (x+1)[8x+5]=0(x+1)[8x + 5] = 0

    This equation holds true if either factor is zero:

    x+1=0or8x+5=0x+1 = 0 \quad \text{or} \quad 8x+5 = 0

    Solving the first equation:

    x=−1x = -1

    Solving the second equation:

    8x=−58x = -5 x=−58x = -\frac{5}{8}

    The values of xx for which f(x+1)=0f(x+1) = 0 are −1,−58\boxed{-1, -\frac{5}{8}}.

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