exam Maths Puzzle Numerical Ability

Could someone help me to solve
2x^2+3x-1 using the quadratic formula which is -b+-(sqrt)b^2-4ac/2a

Thanks so much for your help in advance!

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exam Other Question

If a rectangular solid (4x5x7) is inscribed in a sphere, what is the radius of the sphere? (Is the diameter the diagonal of the rectangular solid? I know it would be if the rectangular solid were a cube.) If so, I got the radius to be 4.7434. A company borrowed $1500. It must make monthly payments of $40.50 for 42 months to pay off the loan. Use the constant ratio formula for APR to find the annual percentage rate.

YIkes! Please help

Ellen