SAT Mathematics Practice Test 6

The given expression $\left(2{\mathit{x}}^2-4\right)-\left(-3{\mathit{x}}^2+2\mathit{x}-7\right)$ can be written as $2{\mathit{x}}^2-4+3{\mathit{x}}^2-2\mathit{x}+7$Combining like terms yields $5{\mathit{x}}^2-2\mathit{x}+3$
Choices B, C, and D are incorrect because they are the result of errors when applying the distributive property.