Q. Solve the quadratic by factoring.4x2−x−3=3xAnswer: x=
Move Terms to One Side: Move all terms to one side of the equation to set the equation to zero.Subtract 3x from both sides to get 4x2−x−3−3x=0.Combine like terms to get 4x2−4x−3=0.
Factor Quadratic Equation: Factor the quadratic equation4x2−4x−3. We need to find two numbers that multiply to (4)(−3)=−12 and add up to −4. The numbers −6 and +2 satisfy these conditions because −6×2=−12 and −6+2=−4.
Rewrite Middle Term: Rewrite the middle term using the numbers found in Step 2.4x2−4x−3 can be written as 4x2−6x+2x−3.
Factor by Grouping: Factor by grouping.Group the first two terms and the last two terms separately.(4x2−6x)+(2x−3)Factor out the common factor of 2x from the first group and 1 from the second group.2x(2x−3)+1(2x−3)
Set Factors Equal to Zero: Factor out the common binomial factor.The common binomial factor is (2x−3).(2x−3)(2x+1)
Set Factors Equal to Zero: Factor out the common binomial factor.The common binomial factor is (2x−3).(2x−3)(2x+1)Set each factor equal to zero and solve for x.2x−3=0 and 2x+1=0For 2x−3=0, add 3 to both sides to get 2x=3, then divide by 2 to get x=23.For 2x+1=0, subtract (2x−3)(2x+1)1 from both sides to get (2x−3)(2x+1)2, then divide by 2 to get (2x−3)(2x+1)4.
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