Quadratic equation

Solve a quadratic equation:

2x2+28x-550=0

Correct answer:

x1 =  11
x2 =  -25

Step-by-step explanation:

2x2+28x550=0  2 x2+28 x550=0 2x2+28x550=0 2 ...  prime number 28=227 550=25211 GCD(2,28,550)=2  x2+14x275=0  a=1;b=14;c=275 D=b24ac=14241(275)=1296 D>0  x1,2=2ab±D=214±1296 x1,2=214±36 x1,2=7±18 x1=11 x2=25

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