simplify the expression.\n7x² + 3 - 5(x² - 4)

Explanation:

Step1: Expand the brackets

$7x^{2}+3 - 5(x^{2}-4)=7x^{2}+3-(5x^{2}-20)=7x^{2}+3 - 5x^{2}+20$

Step2: Combine like - terms

$(7x^{2}-5x^{2})+(3 + 20)=2x^{2}+23$

Answer:

$2x^{2}+23$