Factor Quadratic Equation: We are given the quadratic equation2x2−12x+18=0. The first step is to try to factor the quadratic, if possible. We look for two numbers that multiply to 2×18 (which is 36) and add up to −12.
Identify Common Factors: We notice that the numbers −6 and −6 multiply to 36 and add up to −12. So we can write the quadratic as 2x2−6x−6x+18=0.
Factor by Grouping: Now we can factor by grouping. We group the terms as 2x2−6x and −6x+18 and factor out the common factors from each group.
Simplify Factors: From the first group, we factor out 2x, and from the second group, we factor out −6. This gives us 2x(x−3)−6(x−3)=0.
Apply Zero Product Property: Since both terms have a common factor of (x−3), we can factor this out to get (2x−6)(x−3)=0.
Set Factors Equal: We can simplify the first factor by dividing by 2, which gives us (x−3)(x−3)=0 or (x−3)2=0.
Solve for x: Now we can use the zero product property, which states that if a product of factors equals zero, then at least one of the factors must be zero. We set each factor equal to zero: x−3=0.
Solve for x: Now we can use the zero product property, which states that if a product of factors equals zero, then at least one of the factors must be zero. We set each factor equal to zero: x−3=0.Solving for x, we add 3 to both sides of the equation to get x=3.
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