Q. Solve the equation x2+17x+45=0 to the nearest tenth.Answer: x=
Identify the quadratic equation: Identify the quadratic equation.The given equation is x2+17x+45=0, which is a quadratic equation in the standard form ax2+bx+c=0, where a=1, b=17, and c=45.
Apply the quadratic formula: Apply the quadratic formula to find the solutions for x. The quadratic formula is x=2a−b±b2−4ac. For our equation, a=1, b=17, and c=45.
Calculate the discriminant: Calculate the discriminant b2−4ac.Discriminant = b2−4ac=(17)2−4(1)(45)=289−180=109.
Calculate the two solutions: Calculate the two solutions using the quadratic formula.x=2a−b±discriminantx=2−17±109
Calculate the first solution: Calculate the first solution (using the '+' in '±').x1=2−17+109x1≈2−17+10.4403x1≈2−6.5597x1≈−3.27985Round to the nearest tenth: x1≈−3.3
Calculate the second solution: Calculate the second solution (using the '-' in '±').x2=2−17−109x2≈2−17−10.4403x2≈2−27.4403x2≈−13.72015Round to the nearest tenth: x2≈−13.7
More problems from Solve exponential equations using common logarithms