Exercise 81 Page 110

We can determine whether - 34 is a solution by substituting it into the equation and simplifying using the order of operations.

- x^2+4x? =19/3x^2

Substitute

x= -3/4

-( -3/4)^2+4( -3/4)? =19/3( -3/4)^2

CalcPow

Calculate power

-(9/16)+4(-3/4)? =19/3(9/16)

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Multiply fractions

MultFrac

Multiply fractions

-(9/16)+4(-3/4)? =19*9/3*16

ReduceFrac

a/b=.a /3./.b /3.

-(9/16)+4(-3/4)? =19*3/16

Multiply

Multiply

-(9/16)+4(-3/4)? =57/16

MoveLeftFacToNum

a*b/c= a* b/c

-(9/16)-12/4? =57/16

ExpandFrac

a/b=a * 4/b * 4

-(9/16)-48/16? =57/16

SubFrac

Subtract fractions

-57/16≠57/16

Since both sides are not equal, - 34 is not a solution.