solve √(x-3) + √(2x+1) = √(3x+4)
Step 1: square both sides
x - 3 + 2x + 1 + 2√((x-3)(2x+1)) = 3x + 4
Step 2: gather like terms
3x -2 + 2√((x-3)(2x+1)) = 3x + 4
Step 3: add -(3x -2) to both sides
2√((x-3)(2x+1)) = 6
Step 4: divide both sides by 2 to simplify as much as possible
√((x-3)(2x+1)) = 3
Step4: square both sides to get rid of √(,,,,)
(x-3)(2x+1) = 9
Step 4: distribute and add -9 to both sides
2x^2 -6x +x - 3 -9 = 0
Step 5: gather like terms
2x^2 -5x -12 = 0
Step 6: factor
(x -4)(2x + 3) = 0
Step 7: solve
x = 4 or x = -3/2
Square both sides to cancel off the square roots:
[√(x-3) + √(2x+1)] [√(x-3) + √(2x+1)] = 3x + 4
Expand the brackets using the foil method:
x - 3 + 2√(x-3)(2x+1) + 2x + 1 = 3x + 4
Add the like terms:
3x - 2 + 2√(x-3)(2x+1) = 3x + 4
Subtract 3x from both sides:
-2 + 2√(x-3)(2x+1) = 4
Add 2 to both sides:
2√(x-3)(2x+1) = 6
Divide both sides by 2:
√(x-3)(2x+1) = 3
Square both sides to cancel off the square root:
2x^2 - 5x - 3 = 9
Subtract 9 from both sides:
2x^2 - 5x - 12 = 0
Factor it out:
(2x + 3) (x - 4) = 0
x = 4, - 3/2
shall we assume the question is (2x-a million)/(x+4) = (x+3)/(3x-4) Multiply both part by technique of (x+4) and (3x-4) bypass multiply (2x-a million) (3x-4) = (x+3)(x+4) 6x^2 -11x + 4 = x^2 + 7x +12 convey jointly words 5x^2 -18x - 8 = 0 component (5x + 2)(x - 4) = 0 5x + 2 = 0 or x - 4 =0 x = -2/5 or 4
√(x - 3) + √(2x + 1) = √(3x + 4)
[√(x - 3) + √(2x + 1)]^2 = (3x + 4)
[(x - 3) + 2√((x - 3)(2x + 1)) + (2x + 1)] = (3x + 4)
[3x - 2 + 2√(2x^2 - 5x - 3)] = (3x + 4)
[2√(2x^2 - 5x - 3)] = 6
√(2x^2 - 5x - 3) = 3
(x - 4)(2x + 3) = 0
Solutions:
x = -3/2
x = 4
Copyright © 2024 1QUIZZ.COM - All rights reserved.
Answers & Comments
Verified answer
Step 1: square both sides
x - 3 + 2x + 1 + 2√((x-3)(2x+1)) = 3x + 4
Step 2: gather like terms
3x -2 + 2√((x-3)(2x+1)) = 3x + 4
Step 3: add -(3x -2) to both sides
2√((x-3)(2x+1)) = 6
Step 4: divide both sides by 2 to simplify as much as possible
√((x-3)(2x+1)) = 3
Step4: square both sides to get rid of √(,,,,)
(x-3)(2x+1) = 9
Step 4: distribute and add -9 to both sides
2x^2 -6x +x - 3 -9 = 0
Step 5: gather like terms
2x^2 -5x -12 = 0
Step 6: factor
(x -4)(2x + 3) = 0
Step 7: solve
x = 4 or x = -3/2
Square both sides to cancel off the square roots:
[√(x-3) + √(2x+1)] [√(x-3) + √(2x+1)] = 3x + 4
Expand the brackets using the foil method:
x - 3 + 2√(x-3)(2x+1) + 2x + 1 = 3x + 4
Add the like terms:
3x - 2 + 2√(x-3)(2x+1) = 3x + 4
Subtract 3x from both sides:
-2 + 2√(x-3)(2x+1) = 4
Add 2 to both sides:
2√(x-3)(2x+1) = 6
Divide both sides by 2:
√(x-3)(2x+1) = 3
Square both sides to cancel off the square root:
(x-3)(2x+1) = 9
Expand the brackets using the foil method:
2x^2 - 5x - 3 = 9
Subtract 9 from both sides:
2x^2 - 5x - 12 = 0
Factor it out:
(2x + 3) (x - 4) = 0
x = 4, - 3/2
shall we assume the question is (2x-a million)/(x+4) = (x+3)/(3x-4) Multiply both part by technique of (x+4) and (3x-4) bypass multiply (2x-a million) (3x-4) = (x+3)(x+4) 6x^2 -11x + 4 = x^2 + 7x +12 convey jointly words 5x^2 -18x - 8 = 0 component (5x + 2)(x - 4) = 0 5x + 2 = 0 or x - 4 =0 x = -2/5 or 4
√(x - 3) + √(2x + 1) = √(3x + 4)
[√(x - 3) + √(2x + 1)]^2 = (3x + 4)
[(x - 3) + 2√((x - 3)(2x + 1)) + (2x + 1)] = (3x + 4)
[3x - 2 + 2√(2x^2 - 5x - 3)] = (3x + 4)
[2√(2x^2 - 5x - 3)] = 6
√(2x^2 - 5x - 3) = 3
2x^2 - 5x - 3 = 9
2x^2 - 5x - 12 = 0
(x - 4)(2x + 3) = 0
Solutions:
x = -3/2
x = 4