2 years ago

What is the solution set of the equation x²+3x-4=6

Mathematics

1 answer:

likoan [24]2 years ago

8 0

Answer:

x=2

x=-5

Step-by-step explanation:

Move terms to the left side

Subtract the numbers

Use the sum-product pattern

Factor

Create two separate equations

Solve

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Sveta_85 [38]

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2 years ago

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2 years ago

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never [62]

We'll use the following properties of sine and cosine to prove this:

$sin(a)\cdot sin(b) = \frac12(cos(a-b) - cos(a+b))$

$cos(a)\cdot cos(b) = \frac12(cos(a+b) + cos(a-b))$

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Then it's just a matter of filling it in...

sin20sin40 * sin60sin80 = 1/2(cos20 - cos60) * 1/2 (cos20 - cos140) =

1/8( cos40 + 1 - cos160 - cos120 - cos40 - cos80 + cos80 + cos200) =

1/8(1 - cos160 - cos120 + cos200) =

1/8(1 - cos160 - cos120 + cos160) =

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3 years ago

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Xelga [282]

Go to math papa it really helps

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