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puteri [66]
1 year ago
13

Solve x^2 + x - 12 = 0

Mathematics
1 answer:
bogdanovich [222]1 year ago
6 0

Answer:

x₁ = -4

x₂ = 3

Step-by-step explanation:

x²+ x + 12 = 0

x = {-1±√((1²)-(4*1*-12))} / (2*1)

x = {-1±√(1+48)} / 2

x = {-1±√49} / 2

x = {-1±7} / 2

x₁ = {-1-7} / 2 = -8/2 = -4

x₂ = {-1+7} / 2 = 6/2 = 3

Check:

x₁

-4² + (-4) - 12 = 0

16 - 4 - 12 = 0

x₂

3² + 3 - 12 = 0

9 + 3 - 12 = 0

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Last year , there were 30 male members and 20 female members in a Chess Club . This year , the number of male members is decreas
LekaFEV [45]

The r% of a quantity x is computed by dividing x in 100 parts, and considering r of such parts. So, the r% of the male is

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The number of males decreased by this quantity, so now it is

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we know that these two new counts are the same number, so we can build and solve the equality

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Let's check the answer

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2 years ago
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4 0
3 years ago
Can someone please help?
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3 years ago
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