Question

Write the quadratic equation in standard form. What is the value of b 2 - 4ac? 1 = 2x 2 + 7x 40 41 57

Answer 1

`2x^2+7x-1=0`

the value of
`b^2-4ac` is 57

Explanation:

`1 = 2x^2 + 7x`

Standard form of a quadratic equation is
`ax^2+bx+c=0`

Subtract 1 on both sides to get the standard form of the equation.

`2x^2+7x-1=0`

Now we find the value of
`b^2-4ac`

From the standard form, the value of a=2, b=7, c=-1

the value of
`b^2-4ac=(7)^2-4(2)(-1)=49+8=57`

the value of
`b^2-4ac` is 57