Changes made to your input should not affect the solution:
(1): "z2" was replaced by "z^2".
Step by step solution :
Step 1 :
Trying to factor by splitting the middle term
1.1 Factoring z2-z-6
The first term is, z2 its coefficient is 1 . The middle term is, -z its coefficient is -1 . The last term, "the constant", is -6
Step-1 : Multiply the coefficient of the first term by the constant 1 • -6 = -6
Step-2 : Find two factors of -6 whose sum equals the coefficient of the middle term, which is -1 .
-6 + 1 = -5 -3 + 2 = -1 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -3 and 2 z2 - 3z + 2z - 6
Step-4 : Add up the first 2 terms, pulling out like factors : z • (z-3) Add up the last 2 terms, pulling out common factors : 2 • (z-3) Step-5 : Add up the four terms of step 4 : (z+2) • (z-3) Which is the desired factorization
Equation at the end of step 1 :
(z + 2) • (z - 3) = 0 Step 2 :
Theory - Roots of a product :
2.1 A product of several terms equals zero.
When a product of two or more terms equals zero, then at least one of the terms must be zero.
We shall now solve each term = 0 separately
In other words, we are going to solve as many equations as there are terms in the product
Any solution of term = 0 solves product = 0 as well.
Solving a Single Variable Equation :
2.2 Solve : z+2 = 0
Subtract 2 from both sides of the equation : z = -2
