SOLUTION: Tutor: How do I factor by grouping: 18a^3-24a^2b+15ab^2-20b^3 and
How do I solve the following 18x^2+9x-2=0 I'm just not getting this one, I keep coming up with X=0...I'm lost
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Question 86473: Tutor: How do I factor by grouping: 18a^3-24a^2b+15ab^2-20b^3 and
How do I solve the following 18x^2+9x-2=0 I'm just not getting this one, I keep coming up with X=0...I'm lost!
Thank you
Answer by chitra(359) (Show Source): You can put this solution on YOUR website!
The first question is factor on grouping:
Between the first two terms we find as the common factor and the next two terms we find as a common factor.
Hence, the above equation can be written as:
Here we observe that (3a - 4b) is a common factor between the terms.
Thus, the solution.
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The second Probelm is to factorize the given quadratic equation.
The given expression is:
==> The middle terms can be factored as +12x and a -3x which when multiplied gives us
Hence, this can be written as:
==> (3x + 2)(6x - 1) = 0
==> Which implies that either of them is equal to zero.
(3x + 2) = 0 OR (6x - 1) = 0
==> 3x = - 2 OR 6x = 1
==> OR x =
Hence, the solution.
Regards
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