Posted by **Lavern** on Sunday, April 1, 2012 at 12:08pm.

please help

Simplify

Multiply

(27-42)(57+102)

- math problem -
**Steve**, Sunday, April 1, 2012 at 1:22pm
Assuming your garbled symbol means √, we have

(2√7 - 4√2)(5√7 + 10√2)

just think of these as polynomials in x and y

(2x-4y)(5x+10y) = 10x^2 - 40y^2

letting x = √7 and y = √2, we have

10(√7)^2 - 40(√2)^2 = 10*7-40*2 = -10

Some work could have been saved by noting that

(2√7 - 4√2)(5√7 + 10√2)

= 2(√7-2√2) * 5(√7+√2)

= 10(√7-2√2)(√7+2√2)

= 10(7-8)

## Answer this Question

## Related Questions

- Math Problem - please help simplify Multiply (6x+1)(7x^2+5x+4)
- math problem - please help Multiply and simplify answer (v+f)(v^2-vf+f^2)
- Math Problem - Please multiply and simplify the answer I am having trouble with...
- math - how do i do x2+12x+32 x2+12x = 14x+32 subtract 14x from each side 14x=32 ...
- math - Can someone help me with this problem? multiply and simplify 4 1/5 x 10/...
- fractions - my teacher gave us some fraction problems for homework, but I'm ...
- Math 116 Axia - rewrite using multiplication -70/(23) Do not simplify, Type a ...
- Algebra - Can you please check my work? You have helped other students I know. ...
- Math - Multiply and Simplify: (a^x-a^(-x))^3 =(a^x-a^(-x))(a^x-a^(-x))(a^x-a^(-x...
- Algebra (check my answers) - Please check these answers. Multiply -7(2a2 -4) = -...