Which equation has the components of 0 = x2 – 9x – 20 inserted into the quadratic formula correctly? x = startfraction negative 9 plus or minus startroot (negative 9) squared minus 4(1)(negative 20) endroot over 2(1) endfraction x = startfraction 9 plus or minus startroot (negative 9) squared minus 4(1)(20) endroot over 2(1) endfraction x = startfraction 9 plus or minus startroot (negative 9) squared minus 4(1)(negative 20) endroot over 2(1) endfraction x = startfraction negative 9 plus or minus startroot (negative 9) squared + 4(1)(negative 20) endroot over 2(1) endfraction

Step-by-step explanation:

Recall that the quadratic formula gives you the pattern to follow in order to find the solutions to a quadratic equation of the form:

It tells us that we need to use the parameters and in the following formula in order to get the answers for the x-values that solve it:

so, in our case, , , and

then, replacing these values in the formula, we obtain:

Which looks like the third expression you are listing (although it is a little hard to read)

3 1/3 x 2 3/5 = 8 2/3

step-by-step explanation:

just multiply the first number by the second number to get your answer.