Step-by-step explanation:
6-2x=6x-10x+8
6-2x=-4x+8
6-8=-4x+2x
-2=-2x
X=-2/-2
X=1
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Answer:
ab² - 9
Step-by-step explanation:
Given in the question an expression
(ab + 3)(ab - 3)
To product mentally we will use polynomial identity called
Difference of squares
<h3>a² - b² = (a+b)(a-b) </h3>
here a = ab
b = 3
(ab + 3)(ab - 3) = ab² - 3² = ab² - 9
54 = x + (x+6) + x + (x+6)
54 = 4x +12
42 = 4x
10.5 = x
The two shorter sides (x) are 10.5 cm, the two longer sides are (10.5+6, that is 6 cm longer) 16.5 cm. 10.5 + 10.5 + 16.5 + 16.5 = 54 cm.
