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Mathematics
5 October, 07:43
2x2 + 14x - 4 = - x2 + 3x
+4
Answers (
1
)
Kaila Andrade
5 October, 08:05
0
first, lets solve by factoring:
Let's solve your equation step-by-step.
2x2+14x-4=-x2+3x
Step 1: Subtract - x^2+3x from both sides.
2x2+14x-4 - (-x2+3x) = -x2+3x - (-x2+3x)
3x2+11x-4=0
Step 2: Factor left side of equation.
(3x-1) (x+4) = 0
Step 3: Set factors equal to 0.
3x-1=0 or x+4=0
x=
1
3
or x=-4
we can also solve using the quadratic formula:
2x2+14x-4=-x2+3x
Step 1: Subtract - x^2+3x from both sides.
2x2+14x-4 - (-x2+3x) = -x2+3x - (-x2+3x)
3x2+11x-4=0
Step 2: Use quadratic formula with a=3, b=11, c=-4.
x=
-b±√b2-4ac
2a
x=
- (11) ±√ (11) 2-4 (3) (-4)
2 (3)
x=
-11±√169
6
x=
1
3
or x=-4
lastly, we can complete the square.
2x2+14x-4=-x2+3x
Step 1: Add x^2 to both sides.
2x2+14x-4+x2=-x2+3x+x2
3x2+14x-4=3x
Step 2: Subtract 3x from both sides.
3x2+14x-4-3x=3x-3x
3x2+11x-4=0
Step 3: Add 4 to both sides.
3x2+11x-4+4=0+4
3x2+11x=4
Step 4: Since the coefficient of 3x^2 is 3, divide both sides by 3.
3x2+11x
3
=
4
3
x2+
11
3
x=
4
3
Step 5: The coefficient of 11/3x is 11/3. Let b=11/3.
Then we need to add (b/2) ^2=121/36 to both sides to complete the square.
Add 121/36 to both sides.
x2+
11
3
x+
121
36
=
4
3
+
121
36
x2+
11
3
x+
121
36
=
169
36
Step 6: Factor left side.
(x+
11
6
) 2=
169
36
Step 7: Take square root.
x+
11
6
=±√
169
36
Step 8: Add (-11) / 6 to both sides.
x+
11
6
+
-11
6
=
-11
6
±√
169
36
x=
-11
6
±√
169
36
x=
1
3
or x=-4
Answer:
x=
1
3
or x=-4
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