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Solution Set would be the values found for x%5B1%5D , [ x%5B2%5D
x%5E2-3x=7
Written as an Quadratic Equation:
x%5E2-3x-7=0
.
Using the Quadratic Formula to Solve:
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
.
Solved by pluggable solver: SOLVE quadratic equation with variable
Quadratic equation ax%5E2%2Bbx%2Bc=0 (in our case 1x%5E2%2B-3x%2B-7+=+0) has the following solutons:
x%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca
For these solutions to exist, the discriminant b%5E2-4ac should not be a negative number.
First, we need to compute the discriminant b%5E2-4ac: b%5E2-4ac=%28-3%29%5E2-4%2A1%2A-7=37.
Discriminant d=37 is greater than zero. That means that there are two solutions: +x%5B12%5D+=+%28- 3%2B-sqrt%28+37+%29%29%2F2%5Ca.
x%5B1%5D+=+%28-%28-3%29%2Bsqrt%28+37+%29%29%2F2%5C1+=+4.54138126514911
x%5B2%5D+=+%28-%28-3%29-sqrt%28+37+%29%29%2F2%5C1+=+-1.54138126514911
Quadratic expression 1x%5E2%2B-3x%2B-7 can be factored:
1x%5E2%2B-3x%2B-7+=+1%28x-4.54138126514911%29%2A%28x- 1.54138126514911%29
Again, the answer is: 4.54138126514911, -1.54138126514911. Here's your graph:
graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+1%2Ax%5E2%2B-3%2Ax%2B-7+%29 ]
(More) 8
2(x + 4) = 30
2x + 8 = 30
2x = 30 - 8
2x = 22
x = 22/2
x = 11
Added 4/29/2013 4:21:19 PM
This answer has been confirmed as correct and helpful.
8
–6 + 3x = –9
3x = -9 + 6
3x = -3
x = -3/3
x = -1
Added 4/29/2013 4:21:57 PM
This answer has been confirmed as correct and helpful.
6
insert the options in the value of x
if x=7; 13 30
if x=11 30=30
so the answer is 11 ie. B
Added 4/30/2013 2:12:43 AM
This answer has been flagged as incorrect.
