Solve using the quadratic formula. Express radical answers as exact roots in simplest radical form: a) 5x^2 + x - 4 = 0 b) f(x) = 2x^2 - 6x - 7

Answer 1

you will use this formula to solve the question

a)5x² + x - 4 = 0; a=5, b=1, c=-4

Then plug a, b, c in the formula

-1±√1-4*5*(-4) divided by 2*5

-1±√81 divided by 10

-1±9 divided by 10

we have 2 cases

First case: -1+9 divided by 10; 8/10=4/5

Second case: -1-9 divided by 10; -10/10 = -1

b)2x² - 6x - 7; a=2, b=-6, c=-7

Please plug a, b, c in the formula

and you are done

I hope that helps

take care