Use the discriminant to describe the roots of each equation. Then select the best description. 7x2 + 1 = 5x
double root
real and irrational root
real and rational root
imaginary root
Help please

It is an imaginary root.

Step-by-step explanation:

When we rearrange the formula, we get 7x^2 - 5x + 1 = 0

When we put it in the quadratic formula: x = (−b±√b^2−4ac ) over 2a, we get x = 5 ± √-5^2-4(7)(1) over 2(7)

The discriminant is inside the square root. It is a -3. And because it is negative, we know that the root is an imaginary root.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!