3 years ago

Use factoring by difference of squares to solve the equation, x^2 - 81 = 0.

Mathematics

1 answer:

Bas_tet [7]3 years ago

7 0

The answer is B +/- 9 !!

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Factor this polynomial.<br> .-2x2 - 7x-3

lapo4ka [179]

Answer:

Its B

Step-by-step explanation:

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3 years ago

Find the 8th term of the geometric sequence 3, 12, 48,...

Sophie [7]

$\begin{gathered} \text{The first term is 3, the common ratio is 4} \\ \text{That means;} \\ a=3,r=4 \\ \text{The nth term is } \\ T_n=ar^{(n-1)} \\ 8th=3\times4^{(8-1)} \\ 8th=3\times4^7 \\ 8th=3\times16384 \\ 8th=49152 \end{gathered}$

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1 year ago

What are the roots of the quadratic equation below 3x2+15x-5=0

fomenos

Answer:

Step-by-step explanation:

$3x^2+15x-5=0\\a = 3\\b = 15\\c = -5\\ x = -b\±\frac{\sqrt{b^{2} -4ac} }{2a} \\x = -(15)\±\frac{\sqrt{15^{2} -4(3)(-5)} }{2(3)} \\x = -15 \±\frac{\sqrt{225+60} }{6} \\x = -15\±\frac{\sqrt{285} }{6} = A$

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3 years ago

There are 9 girls and 10 boys taking dance lessons. Write the ratio that compares the number of girls taking dance lessons to th

Tom [10]

Hey there!

9:19

This is because there are 19 total people taking dance lessons - 9 + 10 - and there are 9 girls taking dance lessons, so the ratio is girls to total students, or 9:19

Hope it helps and have a great day!

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3 years ago

HELP ASAPPPP !!!!!!!!!!!......

irina [24]

Answer:

just use a calculator

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3 years ago