SOLUTION: If 5x + x squared > 100, then x is not? If 5x

SOLUTION: If 5x + x squared > 100, then x is not? If 5x - 17 = -x + 7, then x is?

Question 1067108: If 5x + x squared > 100, then x is not?
If 5x - 17 = -x + 7, then x is?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
5x+x^2>100
x^2+5x-100>0
x=(1/2)(-5+/- sqrt(25+400)); sqrt (425)=20.62
x=7.81 or -12.81
x is not between -12.81 and 7.81 inclusive.
In the graph below, it is where the function is greater than 0.

5x-17=-x+7
add xto both sides
6x-17=7
add 17 to both sides
6x=24
x=4
check
20-17=-4+7=3 checks.

RELATED QUESTIONS
If 5x+x squared is greater than 100 then x is not: 10 8 7... (answered by rfer)

If 2(x -1) = 14, then x = If 5x + x� > 100, then x is not If 5x - 17 = -x + 7, then (answered by Edwin McCravy,MathLover1)

3 questions; If 2(x -1) = 14, then x If 5x + x� > 100, then x is not If 5x - (answered by jim_thompson5910)

If 5x + x� > 100, then x is not If 2(x -1) = 14, then x = If 5x - 17 = -x + 7, then x... (answered by josgarithmetic)

If 5x - 17 = -x + 7, then x... (answered by rfer)

If 5x - 17 = -x + 7, then x... (answered by lenny460)

If 5x - 17 = -x + 7, then x = (answered by MathLover1)

If 5x + x� > 100, then x is... (answered by MathLover1,ikleyn)

If 5x - 17= -x+7 then what does x... (answered by rfer)