Joseph, let's knock this out.
To solve the quadratic equation x2−x−6=0 by factoring:
Step 1: Identify two numbers that multiply to the constant term (−6) and add up to the coefficient of the x term (−1).
The two numbers are 2 and −3, because 2×(−3)=−6 and 2+(−3)=−1.
Step 2: Rewrite the middle term using these two numbers.
x2+2x−3x−6=0
Step 3: Factor by grouping.
Group the first two terms and the last two terms.
(x2+2x)−(3x+6)=0
Factor out the common term from each group.
x(x+2)−3(x+2)=0
Step 4: Factor out the common binomial (x+2).
(x−3)(x+2)=0
Step 5: Set each factor equal to zero and solve for x.
x−3=0orx+2=0
x=3orx=−2
The solutions are x=3 and x=−2.
The final answers are x=3,x=−2.
What's next?