Question

27 .l'catorise a)(2X + Y b).
Evaluate (405)2 - (395)
28. Factorise a) 4x2+9y2+12xy​

Answer 1

Step-by-step explanation:

${405}^{2} - {395}^{2} \\ = (400 + 5)(400 - 395) \\ = 405 \times 5 \\ = 2025$

$4x²+9y²+12xy \\ = (2 {x})^{2} + ( {3y)}^{2} + 2 \times 2x \times 3y \\ = (2x + 3y) {}^{2}$