Solve the quadratic equation by factoring. 9x^2-16=0

Mathematics

2 answers:

Sindrei [870]3 years ago

5 0

Answer:

Step-by-step explanation:

Harman [31]3 years ago

4 0

Answer:

x= +- 4/3

Step-by-step explanation:

(3x+4)(3x-4)=0

make each equation set to 0 and solve

3x+4=0

subtract 4 from both sides

3x=-4

divide both sides by 3

x=-4/3

3x-4=0

add 4 to both sides

3x=4

divide both sides by 3

x=4/3

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Leya [2.2K]

Answer:

Step-by-step explanation:

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3 years ago

Read 2 more answers

A/20 + 14/15 = 9/15 <br><br> Can i get some help?

KiRa [710]

Method 1:

$\dfrac{a}{20}+\dfrac{14}{15}=\dfrac{9}{15}\ \ \ \ |multiply\ both\ sides\ by\ 60\\\\60\cdot\dfrac{a}{20}+60\cdot\dfrac{14}{15}=60\cdot\dfrac{9}{15}\\\\3a+4\cdot14=4\cdot9\\\\3a+56=36\ \ \ \ |subtract\ 56\ from\ both\ sides\\\\3a=-20\ \ \ \ |divide\ both\ sides\ by\ 3\\\\\boxed{a=-\frac{20}{3}\to a=-6\frac{2}{3}}$

Method 2.

$\dfrac{a}{20}+\dfrac{14}{15}=\dfrac{9}{15}\ \ \ \ |subtract\ \dfrac{14}{15}\ form\ both\ sides\\\\\dfrac{a}{20}=-\dfrac{5}{15}\\\\\dfrac{a}{20}=-\dfrac{1}{3}\ \ \ \ |multiply\ both\ sides\ by\ 20\\\\\boxed{a=-\dfrac{20}{3}\to a=-6\frac{2}{3}}$

3 0

3 years ago

8 + 8r = 3 + 3r can anyone can help me out

MAVERICK [17]

Answer:r = -1

Step-by-step explanation:

8+8r-(3+3r)=0

We add all the numbers together, and all the variables

8r-(3r+3)+8=0

We get rid of parentheses

8r-3r-3+8=0

We add all the numbers together, and all the variables