Solve Equations
1. Solve \(3(2x - 1) - 2(x + 4) = 6\).
Distribute: \(6x - 3 - 2x - 8 = 6\).
Combine like terms: \(4x - 11 = 6\).
Add 11 to both sides: \(4x = 17\).
Divide by 4: \(x = \frac{17}{4}\).
2. Solve \(2(1 - 2x) - (x + 3) = 5(1 - x)\).
Distribute: \(2 - 4x - x - 3 = 5 - 5x\).
Simplify: \(-5x -1 = 5 - 5x\).
Add \(5x\) to both sides: \(-1 = 5\) (false), but check again:
Rearranging gives \(-5x -1 = 5 - 5x\), add \(5x\) to both sides:
\(-1 = 5\), no solution.
But recheck: maybe mistake in simplification.
Step by step:
LHS: \(2 -4x - x - 3 = -5x -1\).
RHS: \(5 - 5x\).
Set equal: \(-5x -1 = 5 - 5x\).
Add \(5x\): \(-1 = 5\), contradiction.
So no solution: choose (d) none.
3. Solve \(\frac{3x - 5}{1 - 2x} = \frac{2}{3}\).
Cross-multiply: \(3(3x - 5) = 2(1 - 2x)\).
Expand: \(9x - 15 = 2 - 4x\).
Add \(4x\): \(13x - 15 = 2\).
Add 15: \(13x = 17\).
Divide by 13: \(x = \frac{17}{13}\).
4. Solve \(\frac{3}{x - 1} + 5 = \frac{7}{x - 1}\).
Subtract \(\frac{3}{x - 1}\): \(5 = \frac{7}{x - 1} - \frac{3}{x - 1} = \frac{4}{x - 1}\).
Multiply both sides by \(x-1\): \(5(x - 1) = 4\).
Expand: \(5x - 5 = 4\).
Add 5: \(5x = 9\).
Divide: \(x = \frac{9}{5}\).
5. Solve \(\frac{2x - 5}{3x + 7} = \frac{2x + 3}{3x}\).
Cross-multiply: \((2x - 5)(3x) = (2x + 3)(3x + 7)\).
Expand left: \(6x^2 - 15x\).
Expand right: \(6x^2 + 14x + 9x + 21 = 6x^2 + 23x + 21\).
Subtract \(6x^2\) from both sides: \(-15x = 23x + 21\).
Add \(15x\): \(0 = 38x + 21\).
Subtract 21: \(-21 = 38x\).
Divide: \(x = -\frac{21}{38}\).
6. Solve \(\frac{3}{x-2} + \frac{4}{x+2} = \frac{1}{x^2 -4}\).
Note \(x^2 -4 = (x-2)(x+2)\).
Multiply both sides by \((x-2)(x+2)\):
\(3(x+2) + 4(x-2) = 1\).
Expand: \(3x + 6 + 4x - 8 = 1\).
Combine: \(7x - 2 = 1\).
Add 2: \(7x = 3\).
Divide: \(x = \frac{3}{7}\).
7. Solve \(\frac{2x}{x-3} - 2 = \frac{3}{x+3}\).
Multiply both sides by \((x-3)(x+3)\):
\(2x(x+3) - 2(x-3)(x+3) = 3(x-3)\).
Expand: \(2x^2 + 6x - 2(x^2 - 9) = 3x - 9\).
Distribute: \(2x^2 + 6x - 2x^2 + 18 = 3x - 9\).
Simplify: \(6x + 18 = 3x - 9\).
Subtract \(3x\): \(3x + 18 = -9\).
Subtract 18: \(3x = -27\).
Divide: \(x = -9\).
8. Solve roots of \(4x^2 + 9x - 17 = 0\).
Use quadratic formula: \(x = \frac{-9 \pm \sqrt{9^2 - 4 \times 4 \times (-17)}}{2 \times 4}\).
Calculate discriminant: \(81 + 272 = 353\).
Roots: \(x = \frac{-9 \pm \sqrt{353}}{8}\).
Approximate \(\sqrt{353} \approx 18.79\).
First root: \(\frac{-9 + 18.79}{8} \approx 1.223\).
Second root: \(\frac{-9 - 18.79}{8} \approx -3.473\).
9. Solve \(6x^2 - 7x + 2 = 0\).
Quadratic formula: \(x = \frac{7 \pm \sqrt{(-7)^2 - 4 \times 6 \times 2}}{2 \times 6}\).
Discriminant: \(49 - 48 = 1\).
Roots: \(x = \frac{7 \pm 1}{12}\).
First root: \(\frac{8}{12} = 0.67\).
Second root: \(\frac{6}{12} = 0.5\).
10. Solve the system:
\(3x - y = -2\)
\(x - 3y = 10\)
Multiply second by 3: \(3x - 9y = 30\).
Subtract first: \((3x - 9y) - (3x - y) = 30 - (-2)\).
Simplify: \(-8y = 32\).
Divide: \(y = -4\).
Substitute into first: \(3x - (-4) = -2\).
Simplify: \(3x + 4 = -2\), \(3x = -6\), \(x = -2\).
Sum: \(x + y = -2 + (-4) = -6\).
**Final Answers:**
1. x = \(\frac{17}{4}\)
2. No solution
3. x = \(\frac{17}{13}\)
4. x = \(\frac{9}{5}\)
5. x = \(-\frac{21}{38}\)
6. x = \(\frac{3}{7}\)
7. x = \(-9\)
8. x = approximately 1.223 or -3.473
9. x = 0.67 or 0.5
10. x + y = -6