Q. Solve the quadratic by factoring.5x2−15x+7=6x+3Answer: x=
Write Standard Form: Write the quadratic equation in standard form by moving all terms to one side.Subtract 6x and 3 from both sides of the equation.5x2−15x+7=6x+3 becomes 5x2−15x−6x+7−3=0.Combine like terms.5x2−21x+4=0.
Subtract Terms: Factor the quadratic equation.We need to find two numbers that multiply to 5×4=20 and add up to −21.The numbers that satisfy these conditions are −20 and −1.Rewrite the middle term using these two numbers.5x2−20x−x+4=0.
Factor Quadratic Equation: Factor by grouping.Group the terms to factor by common factors.(5x2−20x)−(x−4)=0.Factor out the common factors from each group.5x(x−4)−1(x−4)=0.
Factor by Grouping: Factor out the common binomial factor.Since both terms contain (x−4), factor it out.(5x−1)(x−4)=0.
Factor Common Binomial: Solve the factored equation for x. Set each factor equal to zero and solve for x. 5x−1=0 and x−4=0. Solve the first equation: 5x=1 so x=51. Solve the second equation: x=4.
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