please help me with these algebra problems! thank you!

1.) solveb-4acx= ————2afor "a"

2.)simplify:

(5y)/(4xy^{2})•(3)/(5x)•(-3x^{2}y)/(3xy)

* the / means its a fraction.

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- Aug 21st 2012, 10:24 PMkawaiiwayalgebra problems with fractions and letters
please help me with these algebra problems! thank you!

1.) solveb-4acx= ————2afor "a"

2.)simplify:

(5y)/(4xy^{2})•(3)/(5x)•(-3x^{2}y)/(3xy)

* the / means its a fraction. - Aug 21st 2012, 11:34 PMzaidalyafeyRe: algebra problems
1) multiply both sides by 2a

so you get so the 2a's cancel each other

add 4ac to both sides

in LHS take (a) as common factor

divid both sides by the term (2x+4c)

- Aug 22nd 2012, 03:52 AMWilmerRe: algebra problems
1st one: easier if you use criss-cross multiplication (example: if a/b = c/d, then ad = bc):

2ax = b - 4ac : 2ax + 4ac = b : a(2x + 4c) = b : a = b / (2x + 4c)

2nd one: start by cancelling where possible; like 5y / (4xy^2) = 5 / (4xy) - Aug 23rd 2012, 01:52 AMkawaiiwayRe: algebra problems with fractions and letters
wow! thank you so much! i understand!!（＾∇＾）

- Aug 23rd 2012, 01:54 AMkawaiiwayRe: algebra problems
thank you!!! i understand! thank you for helping with both problems ><