write the expressions

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Suppose that the functions r and s are defined for all numbers x as follows: r(x)=x+4 s(x)=3x+2. Write the expressions for (r+s)(x) and (r-s)(x) and evaluate (r*s)(1)

Jun 8th, 2015

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r(x)=x+4  s(x)=3x+2

(r+s)(x)  and(r-s)(x) and evaluate  (r*s)(1)

(r+s)(x)=(x+4+3x+2)

=4x+6

(r-s)(x)=(x-3x+4-2)

-2x+2

(r*s)(1)

(x+4)(3x+2)(1)

x(3x+2)+4(3x+2)

=3x^2+2x+12x+8

=3x^2+14x+8

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Jun 8th, 2015

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