Polynomial

Polynomial

Question : (g-h)(10)

NOTE:
F(x)=x^2-9

g(x)=2x

h(x)=x-3

My Work:


(g-h) +10

Simplify Multiplication on the left side: + 10g - 10h
Substitute for the letter g on the left side: + 10 *(+ 2x )- 10h

Substitute for the letter h on the left side:
+ 10 *(+ 2x )- 10 *(+ x - 3 )

Simplify Multiplication on the left side: + 20x - 10x + 30

Combine like terms on the left side: + 10x + 30

Subtract + 30 from each side: + 10x + 30 - 30 - 30

Divide each side by + 10 .

+ 10x =- 30

+ 10 + 10

+ x =- 3

Am I right?