Answer:
B)
Step-by-step explanation:
The isosceles triangle is simply defined as needing to have AT LEAST two sides of equal length, so the equilateral triangle is included within the category of the isosceles triangle. Thus, the best answer is B).
BC = kBX
<span>CD = kXY </span>
<span>BC/BX = k = 10/6 </span>
<span>CD/XY = k = 10/6 = CD/4 </span>
<span>10/6 = CD/4 </span>
<span>CD = 40/6 = 6 2/3</span>
Answer:
It can be factorised
Step-by-step explanation:
Given
x²y² + 36 - 4x² - 9y² ( rearranging )
x²y² - 4x² - 9y² + 36 ( factor first/second and third/fourth terms )
= x²(y² - 4) - 9(y² - 4) ← factor out (y² - 4) from each term
= (y² - 4)(x² - 9)
Both factors are a difference of squares and factor in general as
a² - b² = (a - b)(a + b)
Thus
y² - 4
= y² - 2² = (y - 2)(y + 2) , and
x² - 9
= x² - 3² = (x - 3)(x + 3)
Hence
x²y² + 36 - 4x² - 9y² = (y - 2)(y + 2)(x - 3)(x + 3)
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