SOLUTION: Having trouble with this equation{{{ (x/3 + 3/4)*(3x/4 - 3/5) }}} i dont remember how to multipy fractions. could you show me how to solve the probelm so that I may use it to solv

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Having trouble with this equation{{{ (x/3 + 3/4)*(3x/4 - 3/5) }}} i dont remember how to multipy fractions. could you show me how to solve the probelm so that I may use it to solv      Log On


   

Question 89893: Having trouble with this equation+%28x%2F3+%2B+3%2F4%29%2A%283x%2F4+-+3%2F5%29+
i dont remember how to multipy fractions. could you show me how to solve the probelm so that I may use it to solve a few other math problems.
Found 2 solutions by jim_thompson5910, stanbon:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
+%28x%2F3+%2B+3%2F4%29%2A%283x%2F4+-+3%2F5%29+

Foil

+3x%5E2%2F12+-++3x%2F15+%2B+9x%2F16+-+9%2F20+ Multiply

+x%5E2%2F4+-++x%2F5+%2B+9x%2F16+-+9%2F20+ Reduce

+x%5E2%2F4+-++16x%2F80+%2B+45x%2F80+-+9%2F20+ Convert to equivalent fraction

+x%5E2%2F4+%2B+29x%2F80+-+9%2F20+ Combine like terms
Since you don't have an equal sign, this is not an equation. So you cannot solve for x. So you can only simplify the expression.

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
(x/3 + 3/4)*(3x/4 - 3/5)
Use FOIL to get:
F: x^2/4
O: (-1/5)x
I: (9/16)x
L: (9/20)
----------------
= (1/4)x^2 +(29/80)x+(9/20)
================
Cheers,
Stan H.