Plz Help me and thank you

Question

1. f(x)=3x²+7x

g(x)=6x+3

Find f(x)-g(x)

2.f(x)=3x²+7x

g(x)=6x+3

Find f(3)+g(3)

Answer 1

Hi,

1. f(x)=3x²+7x

g(x)=6x+3

Find f(x)-g(x)

First, you need to know the meaning of f(x)-g(x)

Meaning is the difference of two function, what is function? function is f(x) or g(x) = ......

f(x)-g(x) = (3x²+7x ) - ( 6x+3 ) then you need to simplify

= 3x²+7x - 6x-3 = 3x² + x - 3

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f(x)=3x²+7x

g(x)=6x+3

what is f(3)+g(3)? , you need to know the meaning of f(3)+g(3), it means you must replace 3 instead of x in both functions

f(3) = 3(3)^2 + 7(3) = 27 + 21 = 48 and g(3) = 6(3) + 3 = 18 + 3 = 21

Now f(3)+g(3) = 48 + 21 = 69

I hope it is useful,

Minoo

Answer 2

1. f(x)=3x²+7x

g(x)=6x+3

Find f(x)-g(x)

f(x) - g(x) = (3x²+7x)-(6x+3) = 3x² + 7x - 6x + 3 = 3x² + (7x-6x) + 3 = 3x² + x + 3

2.f(x)=3x²+7x

g(x)=6x+3

Find f(3)+g(3)

First, find f(3) = 3*(3)² + 7(3) = 3*9 + 21 = 27 + 21 = 48

and then find g(3) = 6*(3) + 3 = 18 + 21

Finally, f(3) + g(3) = 48 + 21 = 69

Answer 3

f-g = 3x^2 +7x - 6x -3= 3x^2 +x -3

f+g = 3x^2 +7x +6x + 3= 3x^2 +13x +3

f(3)+g(3) = 3(3)^2 +13(3) + 3) = 27+39+3 = 69