Q. Solve the quadratic by factoring.3x2+5x−9=−7Answer: x=
Move and Combine Terms: First, we need to move all terms to one side of the equation to set it equal to zero.3x2+5x−9+7=0Now, combine like terms.3x2+5x−2=0
Identify a, b, c: Identify a, b, and c in the quadratic equationax2+bx+c=0.For the equation 3x2+5x−2=0, we have:a=3b=5b0
Find Multiplying Numbers: Find two numbers that multiply to a∗c (which is 3∗(−2)=−6) and add up to b (which is 5).The numbers that satisfy these conditions are 6 and −1 because:6∗(−1)=−6 (product is a∗c)6+(−1)=5 (sum is b)
Rewrite Middle Term: Rewrite the middle term 5x using the two numbers found in the previous step. 3x2+6x−x−2=0 Now we have four terms and can proceed with factoring by grouping.
Factor by Grouping: Group the terms to factor by grouping.(3x2+6x)−(x+2)=0Factor out the common factors from each group.3x(x+2)−1(x+2)=0
Factor Out Common Factor: Now that we have a common factor of (x+2), factor it out.(3x−1)(x+2)=0
Set Factors Equal: Set each factor equal to zero and solve for x.First factor: 3x−1=0Add 1 to both sides: 3x=1Divide by 3: x=31
Solve for x: Now solve for x using the second factor.Second factor: x+2=0Subtract 2 from both sides: x=−2
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