Q. Solve the equation x2−7x+8=0 to the nearest tenth.Answer: x=
Identify Equation Type: Identify the type of equation.We have a quadratic equation in the form of ax2+bx+c=0, where a=1, b=−7, and c=8.
Solve Using Quadratic Formula: Solve the quadratic equation using the quadratic formula.The quadratic formula is x=2a−b±b2−4ac.Here, a=1, b=−7, and c=8.
Calculate Discriminant: Calculate the discriminant b2−4ac.Discriminant = (−7)2−4(1)(8)=49−32=17.
Apply to Quadratic Formula: Apply the discriminant to the quadratic formula.x=2⋅1−(−7)±17x=27±17
Calculate Possible Solutions: Calculate the two possible solutions for x.First solution: x=27+17Second solution: x=27−17
Evaluate Solutions: Evaluate the solutions to the nearest tenth.First solution: x≈(7+4.123)/2≈11.123/2≈5.6Second solution: x≈(7−4.123)/2≈2.877/2≈1.4
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