We substitute the given into the equation
given: a=-1, b=2, c=[tex] \frac{-1}{4} [/tex]
=([tex] \frac{4b-3}{2a} [/tex]-1
=[tex] \frac{4(2)-3}{2(-1)} [/tex]-1
=[tex] \frac{8-3}{-2} [/tex]-1
=[tex] \frac{5}{-2} [/tex]-1
to continue, we can either find a common denominator or change the fraction to decimal.
Fraction to Decimal:
[tex] \frac{5}{-2} [/tex]=-2.5
Equation=-2.5-1=-3.5
OR Common Denominator:
=[tex] \frac{5}{-2} [/tex][tex] \frac{-1}{1} [/tex]×[tex] \frac{-2}{-2} [/tex] (denominator should be -2=common)
=[tex] \frac{5}{-2} [/tex]+[tex] \frac{2}{-2} [/tex]
=[tex] \frac{7}{-2} [/tex]
which also = to -3.5
