Question

What are the solutions to y=10x2+29x−21

x= and x=

Enter your answers as a fraction. examples: 1/2 4/9 9/5

Answer 1

x 2 +(29/10)x-(21/10) = 0 Add 21/10 to both side of the equation : x 2 +(29/10)x = 21/10 Now the clever bit: Take the coefficient of x , which is 29/10 , divide by two, giving 29/20 , and finally square it giving 841/400 Add 841/400 to both sides of the equation

Explanation: