Polynomials (3a-5)(2a-3)

Polynomials (3a-5)(2a-3)

Postby Guest » Wed Jan 25, 2012 7:34 pm

Expand and simplify
(3a-5)(2a-3)


how do i do these kind of questions?!?!?!
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Re: Polynomials (3a-5)(2a-3)

Postby Math Tutor » Thu Jan 26, 2012 4:11 am

3a * 2a + 3a*(-3) + (-5)*2a + (-5)*(-3) = 6a2 - 6a - 10a + 15 = 6a2 - 16a + 15

Do you understand the simplify rule?

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Re: Polynomials (3a-5)(2a-3)

Postby Math Tutor » Thu Jan 26, 2012 4:13 am

How will you simplify this:

(a-4)(6a-8) = ?

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Re: Polynomials (3a-5)(2a-3)

Postby Guest » Thu Jan 26, 2012 3:23 pm

[tex]6a^2-24a-8a+32=6a^2-32a+32[/tex]
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Re: Polynomials (3a-5)(2a-3)

Postby manoj9585 » Fri Jun 01, 2012 7:30 am

Equations is : (3a-5)(2a-3)

For the expansion of this equation we have to multiply each term to another term :

(3a * 2a) - (5 * 2a) - (3a * 3) + (5 * 3)

=> 6a^2 - 10a - 9a + 15
=> 6a^2 - 19a + 15

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Re: Polynomials (3a-5)(2a-3)

Postby perfectmath » Sat Jun 30, 2012 3:35 am

Math Tutor wrote:How will you simplify this:

(a-4)(6a-8) = ?

It is [tex](a-4)(6a-8)=2(a-4)(3a-4)=2(3a^2-4a-12a+16)=2(3a^2-16a+16)=6a^2-32a+32[/tex]
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