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lidiya [134]
2 years ago
13

Multiply: (3x + 7)(5x2 − 3x + 6) A) 15x3 + 26x2 − 39x + 42 B) 15x3 + 26x2 + 3x + 42 C) 15x3 − 44x2 − 3x + 42 D) 15x3 + 26x2 − 3x

+ 42
Mathematics
2 answers:
GREYUIT [131]2 years ago
6 0

Answer:

15x^3+26x^2-3x+42

Step-by-step explanation:

Multiply (3x + 7)(5x^2 - 3x + 6)

To multiply two parenthesis , we first multiply 3x inside the second parenthesis and then we multiply 7 inside the second parenthesis

(3x)(5x^2 - 3x + 6)=15x^3-9x^2+18x

Now multiply 7 inside the second parenthesis

(7)(5x^2 - 3x + 6)=35x^2-21x+42

Now we add both the answers we got

15x^3-9x^2+18x + 35x^2-21x+42

Lets combine like terms

15x^3+26x^2-3x+42

adell [148]2 years ago
4 0

Answer:

38.5

Step-by-step explanation:

Lets say, first number = x



Second number = 3x+7



Total = 49




(x)+(3x+7)= 49



4x+7 = 49



4x = 42



x = 42/4



x= 10.5




x= 10.5



3x+7 = 3(10.5)+7 = 38.5




Hope this helps!!

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