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Need help with math problem


Multiply

(3x – 7)(3x – 5)

A.
9x 2 + 6x + 35

B.
9x 2 + 36x + 35

C.
9x 2 – 36x – 35

D.
9x 2 – 36x + 35

Respuesta :

ahonyek
(3x – 7)(3x – 5) term by term
1 step: 3x term 
3x*3x - 3x*5  the minus comes as you multiply by -2
2 step: -7 term
-7*3x + 7*5 the second plus comes from -*-=+

add these together
3x*3x-3x*5-7*3x+7*5 and do the multiplications: 
9x^2 -15x-21x+35=9x^2-36x+35

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