You can factor out the two, so you get 2(x^2-9). You can simplify it more because it is a difference of squares, so it should be 2(x-3)(x+3)
Ratio: 72 to 126
can be turned into a fraction 72/126
we then simplify the fraction 72/126
72 ÷ 2 = 36
126 ÷ 2 = 63
36 ÷ 3 = 12
63 ÷ 3 = 21
72/126 ⇒ 36/63 ⇒ 12/21
ratio of 72 to 126 is 12 to 21.
72/126 = 0.5714
12/21 = 0.5714
Answer:
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Step-by-step explanation:
X + y = 7
xy = -30
x + y = 7
x - x + y = -x + 7
y = -x + 7
xy = -30
x(-x + 7) = -30
x(-x) + x(7) = 30
-x² + 7x = -30
-x² + 7x + 30 = 0
-1(x²) - 1(-7x) - 1(-30) = 0
-1(x² - 7x - 30) = 0
-1 -1
x² - 7x - 30 = 0
x² - 10x + 3x - 30 = 0
x(x) - x(10) + 3(x) - 3(10) = 0
x(x - 10) + 3(x - 10) = 0
(x + 3)(x - 10) = 0
x + 3 = 0 or x - 10 = 0
- 3 - 3 + 10 + 10
x = -3 or x = 10
x + y = 7 or x + y = 7
-3 + y = 7 or 10 + y = 7
+ 3 + 3 - 10 - 10
y = 10 or y = -3
(x, y) = (-3, 10) or (x, y) = (10, -3)
The two numbers that add up to 7 and multiply to 30 are -3 and 10.
