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3 years ago

Whats the solutions for f(x)=- x^2-6x-8

Mathematics

2 answers:

poizon [28]3 years ago

7 0

Answer:

x = -4, -2

Step-by-step explanation:

-x² - 6x - 8 = 0

x² + 6x + 8 = 0

x² + 4x + 2x + 8 = 0

x(x + 4) + 2(x + 4) = 0

(x + 4)(x + 2) = 0

x = -4, -2

Aleonysh [2.5K]3 years ago

3 0

Answer:

x=-4 x=-2

Step-by-step explanation:

Set this equal to zero to find the solutions

0=- x^2-6x-8

Divide by -1

0/-1 = x^2 +6x+8

0 = x^2 +6x+8

Factor

What 2 numbers multiply to 8 and add to 6

4*2 = 8

4+2 = 6

0 = (x+4)(x+2)

Using the zero product property

x+4 = 0 x+2 =0

x=-4 x=-2

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Hey there!

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Someone help please!

saveliy_v [14]

Answer:

BC ≈ 14.7 m

Step-by-step explanation:

Using the Sine rule in Δ ABC

$\frac{AB}{sinC}$ = $\frac{BC}{sinA}$

To find ∠ A subtract the 2 given angles from 180°

∠ A = 180° - (90 + 28)° = 180° - 118° = 62°

Then

$\frac{7.8}{sin28}$ = $\frac{BC}{sin62}$ ( cross- multiply )

BC × sin28° = 7.8 × sin62° ( divide both sides by sin28° )

BC = $\frac{7.8sin62}{sin28}$ ≈ 14.7 m ( to 3 significant figures )

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