Solve the following exercise without dividing:
We have hundreds of course questions with personalized recommendations + Account 100% premium
Solve the following exercise without dividing:
Let's solve the given equation:
First, let's arrange the equation by moving and combining like terms:
Now, instead of dividing both sides of the equation by the common factor of all terms in the equation (which is 4), we'll choose to factor it out of the parentheses:
From here remember that the product of expressions will yield 0 only if at least one of the multiplying expressions equals zero,
However, the first factor in the expression that we obtained is 4, which is obviously different from zero, Therefore:
Now we notice that in the resulting equation the coefficient of the quadratic term is not 1. Hence we'll solve the equation using the quadratic formula (let's recall it):
The rule states that for a quadratic equation in the general form:
There are two solutions (or fewer) which we can find using the formula:
,
Let's continue and use the quadratic formula, noting that:
Therefore the solutions to the quadratic equation are:
Let's continue and reduce the fractions in the solutions:
and
Let's summarize the solution of the equation:
Therefore, the correct answer is answer D.
\( x^2-3x-18=0 \)
The problem specifically says "without dividing"! You need to show you understand factoring. Factor out 4 as 4(6x²-11x+3)=0, then solve the simpler quadratic inside the parentheses.
Use the quadratic formula when you can't easily factor the quadratic expression. Here, doesn't factor nicely, so the formula is perfect!
Because if a product equals zero, at least one factor must be zero. Since 4≠0, we need . This is the zero product property!
Find the greatest common factor (GCF) of numerator and denominator. For 18/12, the GCF is 6:
Yes! Substitute both and back into the original equation to verify they work.
Get unlimited access to all 18 Factorization questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime