Monday

July 28, 2014

July 28, 2014

Posted by **Hannah** on Thursday, September 9, 2010 at 5:37pm.

1) x/16 - 1/x all over 1 + 4/x

A) x+4/16

B) x-4/16

C) 16/x+4

D) 16/x-4

E) -16/x+4

I chose answer C. I saw this as x^2-16/ x+4.

Multiply the following using the FOIL method. Express your answer as a single polynomial in standard form.

2) (sqrt a + a)(sqrt a - a)

A) a - a^2

B) a + a^2

C) sqrt a - a^2

D) 2 sqrt a

E) a

I chose answer C.

Simplify the expression. Express answers so that all exponents are positive. Whenever an exponent is 0 or negative, we assume that the base is not 0.

( 8 x^-1 / 3 y^-1)^-2

A) 9 y^2 / 64 x^2

B) 64 x^2 / 9 y^2

C) 64 y^2 / 9 x^2

D) 9 x^2 / 64 y^2

E) -9 x^2 /64 y^2

I chose answer A) 9 y^2 / 64 x^2

- Please check answers) -
**Reiny**, Thursday, September 9, 2010 at 6:11pm1. first multiply both top and bottom of your fraction by 16x/(16x) to get

(x^2 - 16)/(16x-64)

= (x+4)(x-4)/(16(x-4))

= (x+4)/16 which is probably what you meant when you typed a)

2. (√a + a)(√a - a) = a - a^2 , which is b)

3. ( 8 x^-1 / 3 y^-1)^-2

= [(8/x) / (3/y)]^-2

= [(8/x)(y/3)]^-2

= [(8y)/(3x)]^-2

= [(3x)/(8y)]^2

= 9x^2/(64y^2) or D)

- Please check answers) -
**Hannah**, Thursday, September 9, 2010 at 7:57pmSO for #2 the answer is a-a^2 or +a^2?

**Related Questions**

Calculus - Perform the indicated operations and simplify the result. Leave your ...

math- please help! - Please help with these 5 problems! I have the solutions but...

Algebra (check my answers) - Please check these answers. Multiply -7(2a2 -4) = -...

Algebra - Can you please check my work? You have helped other students I know. ...

math - Perform the indicated operation(s) and express the result in standard ...

college algebra - Perform the indicated operation(s) and express the result in ...

algebra 2 - 1.Simplify the difference. n^2 - lOn+24 9 / n^2 - 13n + 42 — 7 A. n...

Precalculus - Hello, Thanks for all of the help guys. I really appreciate it. I ...

Algebra - Perform the indicated operations an write the result in standard form...

Algebra 1 - PERFORM THE INDICATED OPERATIONS AND SIMPLIFY. x-8/x-9-x+1/x+9+x-27/...