How do you solve x2−3x−28=0?
How do you solve
Answer & Explanation
We can first factorise this expression by splitting the middle term and then find the solutions:
Now, we can equate the two factors with zero and find the solutions:
I use the new Transforming Method. Roots have different signs.
Factor pairs of
This sum is
Then the 2 real roots are: -4 and 7.
NOTE. By this method, we can avoid the lengthy factoring by grouping and solving the 2 binomials.