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Kryger [21]
2 years ago
12

Simplify: 9(a + b) + 4(3a + 2b)

Mathematics
2 answers:
amid [387]2 years ago
6 0
B) 9(a+b)+4 (3a+2b)=21a+17b
Aleonysh [2.5K]2 years ago
4 0

Answer:

Option (B) is correct.

The simplified form of the given expression 9\left(a\:+\:b\right)\:+\:4\left(3a\:+\:2b\right) is 21a+17b

Step-by-step explanation:

 Given: expression 9\left(a\:+\:b\right)\:+\:4\left(3a\:+\:2b\right)

We have to simplify the given expression 9\left(a\:+\:b\right)\:+\:4\left(3a\:+\:2b\right) and choose the correct option from given options.

Consider the given expression 9\left(a\:+\:b\right)\:+\:4\left(3a\:+\:2b\right)

Apply distributive rule, a\left(b+c\right)=ab+ac

We have,

=9a+9b+12a+8b

Adding like terms,

LIKE TERMS are terms having same variable with same degree.

9a+12a=21a\\\\ \:9b+8b=17b

We have,

=21a+17b

Thus, The simplified form of the given expression 9\left(a\:+\:b\right)\:+\:4\left(3a\:+\:2b\right) is 21a+17b

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4

Step-by-step explanation:

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2 years ago
If f(x)= 3x squares +1 and g(x) =1-x what is the value of (f-g)(2)
ZanzabumX [31]

Answer: (f-g)(2)=14

Step-by-step explanation:

(f – g) (-2) means the same as subtracting f(2) and g(2). Since we are given f(x) and g(x), we can use them to solve. There are two ways to solve. One is to find f(2) and g(2), and then subtract them. Another way is to do (f-g)(x), then plug in x=2. I will show both methods.

Method 1

f(2)=3(2)²+1                                [exponent]

f(2)=3(4)+1                                  [multiply]

f(2)=12+1                                     [add]

f(2)=13

g(2)=1-(2)                                    [subtract]

g(2)=-1                  

(f-g)(2)=13-(-1)                            [subtract f(2) and g(2)]

(f-g)(2)=14

--------------------------------------------------------------------------------------------------------

Method 2

(f-g)(x)=3x²+1-(1-x)                     [distribute -1]

(f-g)(x)=3x²+1-1+x                      [combine like terms]

(f-g)(x)=3x²+x

(f-g)(2)=3(2)²+2                         [plug in x=2, exponent]

(f-g)(2)=3(4)+2                           [multiply]

(f-g)(2)=12+2                             [add]

(f-g)(2)=14

--------------------------------------------------------------------------------------------------------

Now, we know that (f-g)(2)=14. We confirmed this with both methods.

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