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3 years ago

What is 5z^3+5z^2-6z-6

Mathematics

1 answer:

DochEvi [55]3 years ago

4 0

Answer: (z + 1) (5z2 -6)

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Find the interest rate if £6400 has a final value of £8334 in 3 years. Give your answer to 1 d.p

Mila [183]

Answer:

Step-by-step explanation:

6400(1+i)³=8334

(1+i)³=1.3021875

∛(1+i)³=∛(1.3021875)

1+i= 1.092

i= .092

I guess if you were to round to 1 decimal point it'd be .1

4 0

3 years ago

Make X the subject :))

Rom4ik [11]

Answer:

$x = \frac{3 + 8y}{y - 1}$

Step-by-step explanation:

$y = \frac{x + 3 }{x - 8}$

Cross multiply,

y(x - 8) = x +3

yx - 8y = x + 3

yx - 8y -x = 3

yx - x = 3 + 8y

(y - 1)x = 3 +8y

$x = \frac{3 + 8y}{y - 1}$

3 0

3 years ago

Factor 7(x − 3)2 − 4(x − 3) − 3 completely.

Nezavi [6.7K]

$7(x-3)^2-4(x-3)-3\\\\substitute\ t=x-3,\ then\ we\ have\\\\7t^2-4t-3\\\\a=7;\ b=-4;\ c=-3\\\\\Delta=b^2-4ac\\\\\Delta=(-4)^2-4\cdot7\cdot(-3)=16+84=100\\\\t_1=\dfrac{-b-\sqrt\Delta}{2a};\ t_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\\sqrt\Delta=\sqrt{100}=10\\\\t_1=\dfrac{-(-4)-10}{2\cdot7}=\dfrac{4-10}{14}=\dfrac{-6}{14}=-\dfrac{3}{7}\\\\t_2=\dfrac{-(-4)+10}{2\cdot7}=\dfrac{4+10}{14}=\dfrac{14}{14}=1\\\\7t^2-4t-3=7\left(t+\dfrac{3}{7}\right)(t-1)=(7t+3)(t-1)\\\\=(7(x-3)+3)(x-3-1)=(7x-21+3)(x-4)\\\\=\boxed{(7x-18)(x-4)}$

7 0

4 years ago

PLEASE HELP ASAP WILL GIVE BRAINLIEST!

sweet [91]

5(n) - 2 = 3

3 · 9(m) =27

1. is 27

3^2(s)= 9 · 5(t) = 45 · 2(r) = 90

2. is 90

6 0

3 years ago

I need help urgently plz<br><br>Find x<br>

nikitadnepr [17]

Answer:

X= 70 degrees

Step-by-step explanation:

5 0

4 years ago