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Solve the equation (y+3)(y−5) = 2y−2 for y.

Mathematics

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Answer

y=2±17y = 2 \pm \sqrt{17}

Step-by-step solution

5 steps
  1. Expand the left side of the equation.

    The given equation is (y+3)(y−5)=2y−2(y+3)(y-5) = 2y-2.
    Expand the product on the left side using the FOIL method (First, Outer, Inner, Last).

    (y+3)(y−5)=y⋅y+y⋅(−5)+3⋅y+3⋅(−5)(y+3)(y-5) = y \cdot y + y \cdot (-5) + 3 \cdot y + 3 \cdot (-5) y2−5y+3y−15y^2 - 5y + 3y - 15 y2−2y−15y^2 - 2y - 15
  2. Rewrite the equation with the expanded term.

    y2−2y−15=2y−2y^2 - 2y - 15 = 2y - 2
  3. Move all terms to one side to form a standard quadratic equation ay2+by+c=0ay^2 + by + c = 0.

    Subtract 2y2y from both sides:

    y2−2y−2y−15=−2y^2 - 2y - 2y - 15 = -2 y2−4y−15=−2y^2 - 4y - 15 = -2

    Add 2 to both sides:

    y2−4y−15+2=0y^2 - 4y - 15 + 2 = 0 y2−4y−13=0y^2 - 4y - 13 = 0
  4. Solve the quadratic equation using the quadratic formula.

    The quadratic formula is y=−b±b2−4ac2ay = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}.
    For the equation y2−4y−13=0y^2 - 4y - 13 = 0, we have a=1a=1, b=−4b=-4, and c=−13c=-13.
    Substitute these values into the formula:

    y=−(−4)±(−4)2−4(1)(−13)2(1)y = \frac{-(-4) \pm \sqrt{(-4)^2 - 4(1)(-13)}}{2(1)} y=4±16−(−52)2y = \frac{4 \pm \sqrt{16 - (-52)}}{2} y=4±16+522y = \frac{4 \pm \sqrt{16 + 52}}{2} y=4±682y = \frac{4 \pm \sqrt{68}}{2}
  5. Simplify the radical and the expression for yy.

    Simplify 68\sqrt{68}:

    68=4×17=4×17=217\sqrt{68} = \sqrt{4 \times 17} = \sqrt{4} \times \sqrt{17} = 2\sqrt{17}

    Substitute this back into the expression for yy:

    y=4±2172y = \frac{4 \pm 2\sqrt{17}}{2}

    Divide both terms in the numerator by 2:

    y=42±2172y = \frac{4}{2} \pm \frac{2\sqrt{17}}{2} y=2±17y = 2 \pm \sqrt{17}

    The solutions are y=2+17y = 2 + \sqrt{17} and y=2−17y = 2 - \sqrt{17}.

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