Question

2x²-28x-30=0 complete square with solution

Answer 1

2x²-28x-30=0

we simplify by 2

x²-14x-15=0

b²-4ac =(-14)²-4(1*-15)= 256

Δ is strictly positive, the equation x²−14x−15=0 admits two solutions

(-b-√Δ)/2a =(14-16)/2 = -1

(-b+√Δ)/2a =(-14-16)/2 = 15

x1=-1

x2 =15

Explanation: