Question

J(x)=6x^2-8k(x)=3x^2-x+7calculate (j+k)(x)

Answer 1

the given expressions are

j(x)=6x^2-8

k(x)=3x^2-x+7

add both the equation,

`\begin{gathered} j\mleft(x\mright)=6x^2-8 \\ k\mleft(x\mright)=3x^2-x+7 \end{gathered}`
`\begin{gathered} (j+k)(x)=6x^2-8+3x^2-x+7 \\ (j+k)(x)=9x^2-x-1 \end{gathered}`

so the answer is 9x^2 - x - 1