Answer:
[tex]-4x^1^6[/tex]
Step-by-step explanation:
To simplify, multiply the coefficients of the terms and add the exponents of the same variable together. So, multiply 2 and -2 together, and add the exponents 7 and 9 together while keeping the variable of x:
[tex]-2x^7[/tex] · [tex]2x^9[/tex]
[tex]=-4x^7^+^9\\=-4x^1^6[/tex]
Thus, the answer is [tex]-4x^1^6[/tex].
