Keigh2015
  • Keigh2015
Choose the correct simplification of the expression (7x − 3)(4x2 − 3x − 6). 28x3 − 33x2 − 33x − 18 28x3 + 33x2 − 33x + 18 28x3 − 51x2 − 33x + 18 28x3 − 33x2 − 33x + 18
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Keigh2015
  • Keigh2015
@iGreen @brina15
anonymous
  • anonymous
I'm helping you now give me two seconds.
iGreen
  • iGreen
Just multiply the two expressions together.

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More answers

iGreen
  • iGreen
\(\sf (7x - 3) \times (4x^2 − 3x − 6)\)
Keigh2015
  • Keigh2015
28?
anonymous
  • anonymous
First work with the first term, 7x * 4x^2 and you get 28x^3. Then multiply the first term of the binomial and second term of the trinomial. so 7x * -3x what do you get? @Keigh2015
iGreen
  • iGreen
No, it's kind of like the last question.
iGreen
  • iGreen
Multiply all the terms in the first parenthesis to all the terms in the second parenthesis.
anonymous
  • anonymous
@iGreen let me help her I'm showing her an easy way.
iGreen
  • iGreen
\(\sf 7x \times 4x^2\) \(\sf 7x \times -3x\) \(\sf 7x \times -6\) \(\sf -3 \times 4x^2\) \(\sf -3 \times -3x\) \(\sf -3 \times -6\)
iGreen
  • iGreen
Alright @alexistheking777
anonymous
  • anonymous
@Keigh2015 You see what iGreen posted? Give me the answers to the problems he posted. It is part of the equation and will help you.
Keigh2015
  • Keigh2015
ok hold on
iGreen
  • iGreen
Yeah, after you find those just combine any like terms and you're done..
anonymous
  • anonymous
Have you got your answers?
Keigh2015
  • Keigh2015
almost
Keigh2015
  • Keigh2015
In this order 28x^2 -21x -42x -12x^2 9x 18
anonymous
  • anonymous
Your right for all the ones except the first two. The numbers are right but you forgot to combine the exponents so think of x^2 * x as x^2+1 since x has the exponential value of 1. So you would get an exponential value of 3. So it would be 28x^3. And same goes for x * x so it would be x^1+1 which is 2. So it should be -21x^2. 28x^3 -21x^2 -42x -12x^2 9x 18 Now combine like terms (that is terms with same exponent. So what is -21x^2 + (-12x^2)
anonymous
  • anonymous
@Keigh2015
Keigh2015
  • Keigh2015
28x^3-33x^2
anonymous
  • anonymous
Yes because 28x^3 is the only term with an exponential value of 3 and -21 + (-12) is like -21 - 12 which is 33. Then you replace the x and exponential value so its -33x^2. Good job, now we can eliminate answe C since the second term is 51x^2 which is wrong. So now what is -42x + 9x?
Keigh2015
  • Keigh2015
-33x
anonymous
  • anonymous
By the way we can also eliminate B as well since the second term is positive and ours is negative. And yes it is -33x. Last step is to add the 18 to your equation so combine all those answers you just gave me.
Keigh2015
  • Keigh2015
28x^3-33x^2-33x+18
anonymous
  • anonymous
Correct so when you look at the answers the only one that matches it is D. I hope this helped you don't forget to close this question and choose the person that was the greatest help to you by hitting best response and have a wonderful day. @Keigh2015
Keigh2015
  • Keigh2015
thank you for the help and you too @alexistheking777
anonymous
  • anonymous
No problem.

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