Asked by Tristien
What is the side length of a square with an area of 25x^2 -30+9 ? I'm completely confused on this problem. I do not understand how to factor using the GCF.
Answers
Answered by
John
There is no GCF here.
I assume your -30 is supposed to be -30x. Right?
(5x-3)(5x-3)
This is a perfect square.
You can tell because 5x times 5x
equals the first term and -3 times -3 equals the 9.
When you have perfect squares in the first and last term of the trinomal try the form (ax -b)(ax-b)
I knew to use negatives because the middle term was a negative.
This can also be written as (ax-b)^2
I assume your -30 is supposed to be -30x. Right?
(5x-3)(5x-3)
This is a perfect square.
You can tell because 5x times 5x
equals the first term and -3 times -3 equals the 9.
When you have perfect squares in the first and last term of the trinomal try the form (ax -b)(ax-b)
I knew to use negatives because the middle term was a negative.
This can also be written as (ax-b)^2
Answered by
Damon
s^2 = (5x - 3)(5x - 3) = (5x-3)^2
so
s = 5x-3
when in danger or in doubt:
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
so
s = 5x-3
when in danger or in doubt:
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
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