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Aaron Donovan
Mathematics
7 March, 10:29
Multiply and simplify: (6x + 3y) (6x - 3y)
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Emily
7 March, 10:45
0
36x² - 9y²
Step-by-step explanation:
(6x + 3y) (6x - 3y)
(6x) ² - (3y) ²
36x² - 9y²
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Brylee Clayton
7 March, 10:53
0
36x² - 9y²
Step-by-step explanation:
We see that the given expression (6x + 3y) (6x - 3y) looks just like the expression (a + b) (a - b). When multiplied out, this is a difference of squares identity that I highly recommend you memorise:
(a + b) (a - b) = a² - b²
Here, a = 6x and b = 3y, so plug these in:
(6x + 3y) (6x - 3y) = (6x) ² - (3y) ² = 36x² - 9y²
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