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3 years ago

Multiplying binomials: (a+7) * (a-4)

2 answers:

6 0

The equation when multiplying binomials is a^2 + 2ab + b^2. Therefore when you use FOIL (First, Outer, Inner, Last), you will multiply a times a and a times -4, which gives you a^2 - 4a. Now you take the second term and do 7 times a and 7 times -4, which gives you 7a - 28. Combine them and you have a^2 - 4a + 7a - 28. Then combine the middle two terms and that gives you 3a. You will always have to combine like terms and it will always be the two middle terms. So your answer is a^2 + 3a - 28. Hope this helps. Please rate, leave a thanks, and mark a brainiest answer (Not necessarily mine). Thanks, it really helps! :D

oee [108]3 years ago

4 0

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$3,005.06 is the answer for the question

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3 years ago

23. * MULTIPLE CHOICE Which is the correct factorization of -45x^2 + 20y^2

skad [1K]

Answer:

c)-5(3x+2y)(3x-2y)

Step-by-step explanation:

1) lets find out if -45 and 20 have a GCF

-45 and 20 are both dividable by -5 so

-5(9x^2-4y^2)

1) you can see that 9 and -4 are perfect square so:

-5(3x+2y)(3x-2y)

Recheck:

1) lets use FOIL to see if this is right(if its right we will get back our original equation)

-5(9x^2-6xy+6xy-4y^2)

-5(9x^2-4y^2)

-45x^2+20y^2

hope this helps!

7 0

3 years ago

Danielle needs to have repairs done on her house and is looking to hire a plumber and an electrician. The cost of the plumber fo

mezya [45]

The total cost function is the sum of the two given functions, and this is equal to:

c(t) = 190 + 70*t

<h3>How to find the linear function for the total cost?</h3>

We know that:

The plumber charges p(t) = 115 + 25*t
The electrician charges e(t) = 55*t + 75.

If she hires both of them for the same time t, then the total cost function will be given by the sum of the two above functions, we will get:

c(t) = p(t) + e(t)

c(t) = (115 + 25*t) + (55*t + 75)

c(t) = (115 + 75) + (55*t + 25*t)

c(t) = 190 + 70*t

If you want to learn more about linear functions, you can read:

brainly.com/question/4025726

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2 years ago