b) $(2 \mathrm{x}-3)^{2}-(3-\mathrm{x})(3+\mathrm{x})$

Q: b) $(2 \mathrm{x}-3)^{2}-(3-\mathrm{x})(3+\mathrm{x})$

<p><span class="math-tex">$\begin{array}{l}\mathrm(2 \mathrm{x}-3)^{2}-(3-\mathrm{x})(3+\mathrm{x}) \\ =4 \mathrm{x}^{2}-12 \mathrm{x}+9-9+\mathrm{x}^{2} \\ =5 \mathrm{x}^{2}-12 \mathrm{x}\end{array}$</span></p>

Question

Accepted Answer

$\begin{array}{l}\mathrm(2 \mathrm{x}-3)^{2}-(3-\mathrm{x})(3+\mathrm{x}) \ =4 \mathrm{x}^{2}-12 \mathrm{x}+9-9+\mathrm{x}^{2} \ =5 \mathrm{x}^{2}-12 \mathrm{x}\end{array}$

Đề thi cuối kì 1 (CT) 19-20 - Q. 7 - Tp. Hồ Chí Minh - MĐ 5765