Answer:
-12x²
Step-by-step explanation:
Given expression:
[tex]-5x^{2} -7x^{2}[/tex]
Since both terms in the expression have common terms, we can subtract the terms by combining like terms.
[tex]\implies x^{2} (-5 -7)[/tex]
[tex]\implies x^{2} (-12)[/tex]
[tex]\implies -12x^{2}[/tex]
