Ask question

Ask question

All categories

3 years ago

8

Solve using foil method (x+9)(x+9)

1 answer:

Fudgin [204]3 years ago

3 0

X^2+9x+9x+81
x^2+18x+81
for factoring it

You might be interested in

Please help me with these, oh sweet jesus

Lelechka [254]

Answer:

77. $\cot^{6} x = \cot^{4} x \csc^{2}x - \cot^{4} x$ Proved

78. $\sec^{4}x \tan^{2} x = \sec^{2}x [\tan^{2}x + \tan^{4}x ]$ Proved

79. $\cos^{3} x\sin^{2} x = [\sin^{2}x - \sin^{4}x] \cos x$ Proved.

80. $\sin^{4}x - \cos^{4}x = 1 - 2\cos^{2}x + 2 \cos^{4} x$ Proved.

Step-by-step explanation:

77. Left hand side

= $\cot^{6} x$

= $\cot^{4} x \times \cot^{2} x$

= $\cot^{4}x [\csc^{2}x - 1]$

{Since we know, $\csc^{2} x - \cot^{2}x = 1$ }

= $\cot^{4} x \csc^{2}x - \cot^{4} x$

= Right hand side (Proved)

78. Left hand side

= $\sec^{4}x \tan^{2} x$

= $\sec^{2} x [1 + \tan^{2}x] \tan^{2} x$

{Since $\sec^{2}x - \tan^{2}x = 1$ }

= $\sec^{2}x [\tan^{2}x + \tan^{4}x ]$

= Right hand side (Proved)

79. Left hand side

= $\cos^{3} x\sin^{2} x$

= $\cos x[1 - \sin^{2} x] \sin^{2} x$

{Since $\sin^{2}x + \cos^{2} x = 1$ }

= $[\sin^{2}x - \sin^{4}x] \cos x$

= Right hand side

80. Left hand side

= $\sin^{4}x - \cos^{4}x$

= $[\sin^{2}x + \cos^{2}x]^{2} - 2\sin^{2} x \cos^{2}x$

{Since $\sin^{2}x + \cos^{2} x = 1$ }

= $1 - 2\cos^{2} x[1 - \cos^{2}x ]$

= $1 - 2\cos^{2}x + 2 \cos^{4} x$

= Right hand side. (Proved)

7 0

3 years ago

What is the answer too (17-6 divided by 2 )+ 4 multiplied by 3

Vsevolod [243]

Answer:

Step-by-step explanation:

The answer is 26

4 0

3 years ago

Read 2 more answers

The cast of the play makes 275 programs for 5 shows. How many programs will be needed for 13 shows?

Advocard [28]

715 because 275/5= 55 then 55x13 will give you 715

8 0

3 years ago

Multiply. 35⋅34<br><br> A. 9/20<br><br> B. 4/10<br><br> C. 4/5<br><br> D. 5/4

erma4kov [3.2K]

Answer:

a

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

bill spent less than $26 on a magazine and five composition books. the magazine cost $4. write an inequality to represent the si

emmainna [20.7K]

Answer:

6.5

Step-by-step explanation:

8 0

3 years ago