{20x}^(2) + 7x - 49 Please solve for the value of x with explanation.​

Question

`{20x}^(2) + 7x - 49`
Please solve for the value of x with explanation.​

Answer 1

`{20x}^(2) + 7x - 49 = 0 \\ D = {7}^(2) - 4 * 20 * ( - 49) = 3969 = {63}^(2) \\ x_1 = ( - 7 + 63)/(40) = 1.4 \\ x_2 = ( - 7 - 63)/(40) = - 1.75`