Q. Solve the quadratic by factoring.2x2−9x−6=−10Answer: x=
Move Terms to One Side: Move all terms to one side of the equation to set it equal to zero.We need to add 10 to both sides of the equation to get a standard form of a quadratic equation.2x2−9x−6+10=02x2−9x+4=0
Identify a, b, c: Identify a, b, and c in the quadratic equation 2x2−9x+4. Compare 2x2−9x+4 with ax2+bx+c. a=2b0b1
Find Multiplying Numbers: Find two numbers that multiply to a∗c (2∗4=8) and add up to b (−9).We are looking for two numbers that multiply to 8 and add up to −9.The numbers are −1 and −8 because −1∗−8=8 and −1+−8=−9.
Rewrite Middle Term: Rewrite the middle term of the quadratic equation using the two numbers found in Step 3.2x2−9x+4 can be rewritten by splitting the middle term into −1x and −8x.2x2−1x−8x+4
Factor by Grouping: Factor by grouping.Group the first two terms and the last two terms.(2x2−1x)+(−8x+4)Factor out the greatest common factor from each group.x(2x−1)−4(2x−1)
Factor out Common Binomial: Factor out the common binomial factor.The common binomial factor is (2x−1).x(2x−1)−4(2x−1) can be factored as (2x−1)(x−4).
Set Factors Equal to Zero: Set each factor equal to zero and solve for x.2x−1=0 or x−4=0For 2x−1=0: Add 1 to both sides and then divide by 2.2x=1x=21For x−4=0: Add 4 to both sides.2x−1=00
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