rebecca1233
Factor each trinomial below. Please show your work and check your answer.
a^2 – 5a – 20



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Mathhelp346
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dw:1337737531550:dw

rebecca1233
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Thanks. do you know how to do this

Mathhelp346
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all you would need to do is come up with 2 binomials and then distribute to get the answer

Mathhelp346
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so if i gave you (a+b)(a+b), the answer would be a^2+ab+ba+b^2, or a^2+2ab+b^2

Mathhelp346
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ok, give me 2 numbers

rebecca1233
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can you give me one please cause im quite confused so like x^2 a 25 ?

Mathhelp346
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um not exactly

rebecca1233
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can i use yours as one? cause im quite confused lol

Mathhelp346
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so let's say you have (2+3)(4+5)

Mathhelp346
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what would be your answer?

Mathhelp346
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dw:1337737956653:dw

rebecca1233
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uhmm

Mathhelp346
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dw:1337737995662:dw

rebecca1233
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times? 2 * 4 = 8

Mathhelp346
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yes

rebecca1233
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& 3 *5 = 15

Mathhelp346
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yes, and...?

rebecca1233
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so what would the end look like ?

rebecca1233
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(8+5) ?

rebecca1233
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(8+15)

Mathhelp346
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Rebecca, there's still more. You need to distribute the 2 to both the 4 and 5. Same goes for the 3.

rebecca1233
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im so confused can you show me ?

Mathhelp346
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So basically, you would be solving 2*4+2*5+3*4+3*5

Mathhelp346
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dw:1337738187066:dw

rebecca1233
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simplifying?

Mathhelp346
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actually, we need some x's. hold on.

rebecca1233
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the answer is 45

Mathhelp346
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dw:1337738245824:dw

Mathhelp346
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here

rebecca1233
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Thank you.. i got it :)

Mathhelp346
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ok