نشر فرق المربعات (تمرين 18)

حل تمرين 18

النتائج:

• A = (3x + 5)(3x - 5) = 9x² - 25
• B = (1.5 + 2x)(1.5 - 2x) = 2.25 - 4x²
• C = \left(\dfrac{\sqrt{2}}{5}x - \dfrac{1}{3}\right)\left(\dfrac{\sqrt{2}}{5}x + \dfrac{1}{3}\right) = \left(\dfrac{\sqrt{2}}{5}x\right)^2 - \left(\dfrac{1}{3}\right)^2 = \dfrac{2}{25}x² - \dfrac{1}{9}