Answer:
x={-sqrt(103/7)+4, sqrt(103/7) +4}
Step-by-step explanation:
Subtract 7x from both sides: 7x^2-56x=-9
Divide both sides by 7: x^2-8x=-9/7
Solve for a (2ax=-8x): -4
Plug a back in: -9/7+(-4)^2=103/7
Complete the square: (x-4)^2=103/7
Therefore, x={-sqrt(103/7)+4, sqrt(103/7) +4}
