3 years ago

Using a suitable identity solve the following (7a-9b)(7a-9b)

Mathematics

1 answer:

yuradex [85]3 years ago

4 0

Answer:

49a^2 - 126ab + 81 ^2

Step-by-step explanation:

Suitable identity = (a-b)(a-b) = a^2 - 2ab + b^2

So, to solve this.

(7a-9b)(7a-9b) = 49a^2 - 126ab + 81b^2

Hope this helps

You might be interested in

Evaluate tan(cos^-1 3/5) and assume that all angles are in Quadrant I.

lorasvet [3.4K]

Answer:

Option c

Step-by-step explanation:

We assume that the angle is in the first quadrant.

Observe the attached image.

if $u = cos ^{-1}(\frac{3}{5})$

So:

$cosu = \frac{3}{5}$

By definition:

$cosu= \frac{adjacent}{hypotenuse}$

So:

adjacent side = 3

hypotenuse = 5.

Observe the attached image

We find the opposite side "x" using the Pythagorean theorem.

$x=\sqrt{5^2 -3^2} \\x = 4$

Then, for the angle u:

$tanu = \frac{opposite}{adjacent}\\\\tanu = \frac{x}{3}\\\\tanu = \frac{4}{3}$

4 0

3 years ago

Solve for y 1.2x - 4y = 28

Dovator [93]

Your question is incomplete i guess

6 0

4 years ago

Two fair dice are rolled. What is the probability that the sum or product of the two numbers rolled is either 6 or 7?

zlopas [31]

Answer:

Rolling a 7 is 1/6

Step-by-step explanation:

Add the numbers on the two dice and count how many times this sum is 7. If you do so you will find that the sum is 7 for 6 of the possible outcomes.

Hope this helps :|

5 0

3 years ago

Tickets to a local movie were sold at $6.00 for adults and $4.50 for students. If 110 tickets were sold for a total of $615.00,

meriva

Answer:

101 adults and 9 students

Step-by-step explanation:

4.50 * 2 = 9

6.00 * 101 = 606

606 + 9 = 615

3 0

3 years ago

Which story problem could be solved using the given equation?

frez [133]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers