Question

Write the quadratic equation in general form. What is the value of b2 - 4ac? 1 = 2x2 + 5x? 17 33 34

Answer 1

Answer with explanation:

The given expression is:

  $1=2 x^2 + 5 x\\\\2 x^2 +5 x -1=0$

is general form of the quadratic equation.

Of, the Quadratic expression of the type,

 $\rightarrow ax^2 + b x +c=0\\\\D{\Discriminant}=b^2-4 a c$

For, the given Expression

 $D=(5)^2-4 \times 2 \times (-1)\\\\D=25 +8\\\\D=33$

Option B: 33

Answer 2

2x² + 5x - 1 = 0  ←   in general form

a=2, b=5, c=-1

b²-4ac = 5² - 4*2*(-1) = 25 + 8 = 33