X1+x2=3 x1•x2=-7 quadratic equation answer please

x² - 3x - 7 = 0

Step-by-step explanation:

To write a quadratic equation with given roots, use this:

x² - (x1 + x2)x + (x1.x2) = 0

or

x² - (sum of roots)x + (product of roots) = 0

So substitute the given with sum of 3 and product of -7.

x² - (3)x + (-7) = 0 (simplify)

x² - 3x - 7 = 0

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.

multiply each one by 3.14

step-by-step explanation: