Q. Solve for x. Enter the solutions from least to greatest.4x2+4x−168=0 lesser x=□ greater x=□
Step 1: Factoring Attempt: We have the quadratic equation4x2+4x−168=0. To solve for x, we can first try to factor the quadratic, or use the quadratic formula. Let's start by attempting to factor.
Step 2: Simplifying the Equation: To make factoring easier, we can divide the entire equation by 4 to simplify it, since all terms are divisible by 4. This gives us x2+x−42=0.
Step 3: Finding the Numbers: Now we need to find two numbers that multiply to −42 and add up to 1 (the coefficient of x). The numbers that satisfy these conditions are 7 and −6, because 7×(−6)=−42 and 7+(−6)=1.
Step 4: Rewriting the Equation: We can now rewrite the quadratic equation as (x+7)(x−6)=0.
Step 5: Solving for the First Factor: Setting each factor equal to zero gives us the solutions for x. For the first factor, x+7=0, we solve for x by subtracting 7 from both sides, which gives us x=−7.
Step 6: Solving for the Second Factor: For the second factor, x−6=0, we solve for x by adding 6 to both sides, which gives us x=6.
Step 7: Final Solutions: We have found two solutions: x=−7 and x=6. To answer the question prompt, we list the solutions from least to greatest: −7,6.
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