Q. Solve the equation 3x2−5x−5=0 to the nearest tenth.Answer: x=
Calculate Discriminant: To solve the quadratic equation3x2−5x−5=0, we can use the quadratic formula, which is x=2a−b±b2−4ac, where a, b, and c are the coefficients from the equation ax2+bx+c=0. In our case, a=3, b=−5, and c=−5.
Plug into Quadratic Formula: First, we calculate the discriminant, which is the part under the square root in the quadratic formula: b2−4ac.Discriminant = (−5)2−4×3×(−5)=25+60=85.
Calculate Solutions: Now we can plug the discriminant and the coefficients into the quadratic formula to find the two possible values for x.x=2×3−(−5)±85x=65±85
Approximate Square Root: We will now calculate the two possible solutions for x.First solution: x=65+85Second solution: x=65−85
Round Solutions: Using a calculator, we find the approximate values for the square root of 85 and then for x.85≈9.220First solution: x≈(5+9.220)/6≈14.220/6≈2.370Second solution: x≈(5−9.220)/6≈−4.220/6≈−0.703
Round Solutions: Using a calculator, we find the approximate values for the square root of 85 and then for x.85≈9.220First solution: x≈(5+9.220)/6≈14.220/6≈2.370Second solution: x≈(5−9.220)/6≈−4.220/6≈−0.703Finally, we round the solutions to the nearest tenth.First solution: x≈2.4Second solution: x≈−0.7
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