Step 1. Gather like terms
\(7-(-5x*x)-10,4x\)
Step 2. Use Product Rule: \(x^{a} x^{b} = x^{a+b}\)
\(7-(5 x^{2} )-10,4x\)
Step 3. Simplify brackets
\(7+5 x^{2} -10,4x\)
Step 4. Simplify \(7+5 x^{2} -10\) to \(5x^{2} -3\)
\(5 x^{2} -3,4x\)
7+5{x}^{2}-10
